diff --git a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/JvmMetadataExtensions.kt b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/JvmMetadataExtensions.kt
index 16d492e0daa..85fcf73d734 100644
--- a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/JvmMetadataExtensions.kt
+++ b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/JvmMetadataExtensions.kt
@@ -109,6 +109,8 @@ internal class JvmMetadataExtensions : MetadataExtensions {
 
     override fun readTypeAliasExtensions(v: KmTypeAliasVisitor, proto: ProtoBuf.TypeAlias, c: ReadContext) {}
 
+    override fun readValueParameterExtensions(v: KmValueParameterVisitor, proto: ProtoBuf.ValueParameter, c: ReadContext) {}
+
     override fun writeClassExtensions(type: KmExtensionType, proto: ProtoBuf.Class.Builder, c: WriteContext): KmClassExtensionVisitor? {
         if (type != JvmClassExtensionVisitor.TYPE) return null
         return object : JvmClassExtensionVisitor() {
@@ -276,6 +278,12 @@ internal class JvmMetadataExtensions : MetadataExtensions {
         c: WriteContext
     ): KmTypeAliasExtensionVisitor? = null
 
+    override fun writeValueParameterExtensions(
+        type: KmExtensionType,
+        proto: ProtoBuf.ValueParameter.Builder,
+        c: WriteContext
+    ): KmValueParameterExtensionVisitor? = null
+
     override fun createClassExtension(): KmClassExtension = JvmClassExtension()
 
     override fun createPackageExtension(): KmPackageExtension = JvmPackageExtension()
@@ -295,6 +303,8 @@ internal class JvmMetadataExtensions : MetadataExtensions {
 
     override fun createTypeAliasExtension(): KmTypeAliasExtension = JvmTypeAliasExtension()
 
+    override fun createValueParameterExtension(): KmValueParameterExtension = JvmValueParameterExtension()
+
     private fun JvmMemberSignature.toJvmMethodSignature(c: WriteContext): JvmProtoBuf.JvmMethodSignature =
         JvmProtoBuf.JvmMethodSignature.newBuilder().apply {
             name = c[this@toJvmMethodSignature.name]
diff --git a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/jvmExtensionNodes.kt b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/jvmExtensionNodes.kt
index 3d2bd6f467f..b69e6e0bee9 100644
--- a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/jvmExtensionNodes.kt
+++ b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/impl/jvmExtensionNodes.kt
@@ -183,3 +183,10 @@ internal class JvmTypeAliasExtension : JvmTypeAliasExtensionVisitor(), KmTypeAli
         visitor.visitEnd()
     }
 }
+
+internal class JvmValueParameterExtension : JvmValueParameterExtensionVisitor(), KmValueParameterExtension {
+    override fun accept(visitor: KmValueParameterExtensionVisitor) {
+        require(visitor is JvmValueParameterExtensionVisitor)
+        visitor.visitEnd()
+    }
+}
diff --git a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/jvmExtensionVisitors.kt b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/jvmExtensionVisitors.kt
index 11b7c4a63f3..3bbce8ce2a1 100644
--- a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/jvmExtensionVisitors.kt
+++ b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/jvmExtensionVisitors.kt
@@ -375,3 +375,30 @@ open class JvmTypeAliasExtensionVisitor @JvmOverloads constructor(
         val TYPE: KmExtensionType = KmExtensionType(JvmTypeAliasExtensionVisitor::class)
     }
 }
+
+/**
+ * A visitor to visit JVM extensions for a value parameter.
+ */
+open class JvmValueParameterExtensionVisitor @JvmOverloads constructor(
+    private val delegate: JvmValueParameterExtensionVisitor? = null
+) : KmTypeAliasExtensionVisitor {
+    final override val type: KmExtensionType
+        get() = TYPE
+
+    /**
+     * Visits the end of JVM extensions for the value parameter.
+     */
+    open fun visitEnd() {
+        delegate?.visitEnd()
+    }
+
+    companion object {
+        /**
+         * The type of this extension visitor.
+         *
+         * @see KmExtensionType
+         */
+        @JvmField
+        val TYPE: KmExtensionType = KmExtensionType(JvmValueParameterExtensionVisitor::class)
+    }
+}
diff --git a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibExtensionNodes.kt b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibExtensionNodes.kt
index c6546c95aef..d895fa0c62f 100644
--- a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibExtensionNodes.kt
+++ b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibExtensionNodes.kt
@@ -36,6 +36,9 @@ internal val KmModuleFragment.klibExtensions: KlibModuleFragmentExtension
 internal val KmTypeAlias.klibExtensions: KlibTypeAliasExtension
     get() = visitExtensions(KlibTypeAliasExtensionVisitor.TYPE) as KlibTypeAliasExtension
 
+internal val KmValueParameter.klibExtensions: KlibValueParameterExtension
+    get() = visitExtensions(KlibValueParameterExtensionVisitor.TYPE) as KlibValueParameterExtension
+
 internal class KlibFunctionExtension : KlibFunctionExtensionVisitor(), KmFunctionExtension {
 
     val annotations: MutableList<KmAnnotation> = mutableListOf()
@@ -233,8 +236,21 @@ internal class KlibTypeAliasExtension : KlibTypeAliasExtensionVisitor(), KmTypeA
         this.uniqId = uniqId
     }
 
-    override fun accept(visitor: KmTypeExtensionVisitor) {
+    override fun accept(visitor: KmTypeAliasExtensionVisitor) {
         require(visitor is KlibTypeAliasExtensionVisitor)
         uniqId?.let(visitor::visitUniqId)
     }
+}
+
+internal class KlibValueParameterExtension : KlibValueParameterExtensionVisitor(), KmValueParameterExtension {
+    val annotations: MutableList<KmAnnotation> = mutableListOf()
+
+    override fun visitAnnotation(annotation: KmAnnotation) {
+        annotations += annotation
+    }
+
+    override fun accept(visitor: KmValueParameterExtensionVisitor) {
+        require(visitor is KlibValueParameterExtensionVisitor)
+        annotations.forEach(visitor::visitAnnotation)
+    }
 }
\ No newline at end of file
diff --git a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibMetadataExtensions.kt b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibMetadataExtensions.kt
index 76deea0b3a7..63703e7f2a6 100644
--- a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibMetadataExtensions.kt
+++ b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/impl/klibMetadataExtensions.kt
@@ -134,6 +134,14 @@ internal class KlibMetadataExtensions : MetadataExtensions {
         }
     }
 
+    override fun readValueParameterExtensions(v: KmValueParameterVisitor, proto: ProtoBuf.ValueParameter, c: ReadContext) {
+        val extension = v.visitExtensions(KlibValueParameterExtensionVisitor.TYPE) as? KlibValueParameterExtensionVisitor ?: return
+
+        proto.getExtension(KlibMetadataProtoBuf.parameterAnnotation).forEach { annotation ->
+            extension.visitAnnotation(annotation.readAnnotation(c.strings))
+        }
+    }
+
     override fun writeClassExtensions(type: KmExtensionType, proto: ProtoBuf.Class.Builder, c: WriteContext): KmClassExtensionVisitor? {
         if (type != KlibClassExtensionVisitor.TYPE) return null
         return object : KlibClassExtensionVisitor() {
@@ -348,6 +356,22 @@ internal class KlibMetadataExtensions : MetadataExtensions {
         }
     }
 
+    override fun writeValueParameterExtensions(
+        type: KmExtensionType,
+        proto: ProtoBuf.ValueParameter.Builder,
+        c: WriteContext
+    ): KmValueParameterExtensionVisitor? {
+        if (type != KlibValueParameterExtensionVisitor.TYPE) return null
+        return object : KlibValueParameterExtensionVisitor() {
+            override fun visitAnnotation(annotation: KmAnnotation) {
+                proto.addExtension(
+                    KlibMetadataProtoBuf.parameterAnnotation,
+                    annotation.writeAnnotation(c.strings).build()
+                )
+            }
+        }
+    }
+
     override fun createClassExtension(): KmClassExtension =
         KlibClassExtension()
 
@@ -374,4 +398,7 @@ internal class KlibMetadataExtensions : MetadataExtensions {
 
     override fun createTypeAliasExtension(): KmTypeAliasExtension =
         KlibTypeAliasExtension()
+
+    override fun createValueParameterExtension(): KmValueParameterExtension =
+        KlibValueParameterExtension()
 }
\ No newline at end of file
diff --git a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibExtensions.kt b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibExtensions.kt
index 7ec5f42c46e..a8ff49ec2ef 100644
--- a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibExtensions.kt
+++ b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibExtensions.kt
@@ -108,4 +108,7 @@ var KmTypeAlias.uniqId: UniqId?
     get() = klibExtensions.uniqId
     set(value) {
         klibExtensions.uniqId = value
-    }
\ No newline at end of file
+    }
+
+val KmValueParameter.annotations: MutableList<KmAnnotation>
+    get() = klibExtensions.annotations
\ No newline at end of file
diff --git a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibMetadataExtensionVisitors.kt b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibMetadataExtensionVisitors.kt
index f7db040dffb..197b01469db 100644
--- a/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibMetadataExtensionVisitors.kt
+++ b/libraries/kotlinx-metadata/klib/src/kotlinx/metadata/klib/klibMetadataExtensionVisitors.kt
@@ -139,4 +139,16 @@ abstract class KlibTypeAliasExtensionVisitor : KmTypeAliasExtensionVisitor {
     companion object {
         val TYPE = KmExtensionType(KlibTypeAliasExtensionVisitor::class)
     }
+}
+
+abstract class KlibValueParameterExtensionVisitor : KmValueParameterExtensionVisitor {
+
+    abstract fun visitAnnotation(annotation: KmAnnotation)
+
+    override val type: KmExtensionType
+        get() = TYPE
+
+    companion object {
+        val TYPE = KmExtensionType(KlibValueParameterExtensionVisitor::class)
+    }
 }
\ No newline at end of file
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/extensions.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/extensions.kt
index 93bb31e5af1..2f7f8214ead 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/extensions.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/extensions.kt
@@ -98,3 +98,8 @@ interface KmTypeExtensionVisitor : KmExtensionVisitor
  * A visitor to visit platform-specific extensions for a type alias.
  */
 interface KmTypeAliasExtensionVisitor : KmExtensionVisitor
+
+/**
+ * A visitor to visit platform-specific extensions for a value parameter.
+ */
+interface KmValueParameterExtensionVisitor : KmExtensionVisitor
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/MetadataExtensions.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/MetadataExtensions.kt
index 644f4ebcb56..92f48349a7b 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/MetadataExtensions.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/MetadataExtensions.kt
@@ -30,6 +30,8 @@ interface MetadataExtensions {
 
     fun readTypeAliasExtensions(v: KmTypeAliasVisitor, proto: ProtoBuf.TypeAlias, c: ReadContext)
 
+    fun readValueParameterExtensions(v: KmValueParameterVisitor, proto: ProtoBuf.ValueParameter, c: ReadContext)
+
     fun writeClassExtensions(type: KmExtensionType, proto: ProtoBuf.Class.Builder, c: WriteContext): KmClassExtensionVisitor?
 
     fun writePackageExtensions(type: KmExtensionType, proto: ProtoBuf.Package.Builder, c: WriteContext): KmPackageExtensionVisitor?
@@ -54,6 +56,8 @@ interface MetadataExtensions {
 
     fun writeTypeAliasExtensions(type: KmExtensionType, proto: ProtoBuf.TypeAlias.Builder, c: WriteContext): KmTypeAliasExtensionVisitor?
 
+    fun writeValueParameterExtensions(type: KmExtensionType, proto: ProtoBuf.ValueParameter.Builder, c: WriteContext): KmValueParameterExtensionVisitor?
+
     fun createClassExtension(): KmClassExtension
 
     fun createPackageExtension(): KmPackageExtension
@@ -72,6 +76,8 @@ interface MetadataExtensions {
 
     fun createTypeAliasExtension(): KmTypeAliasExtension
 
+    fun createValueParameterExtension(): KmValueParameterExtension
+
     companion object {
         val INSTANCES: List<MetadataExtensions> by lazy {
             ServiceLoader.load(MetadataExtensions::class.java, MetadataExtensions::class.java.classLoader).toList().also {
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/extensionNodes.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/extensionNodes.kt
index ae34d2faaa9..d38c7fd726e 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/extensionNodes.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/extensions/extensionNodes.kt
@@ -27,4 +27,6 @@ interface KmTypeParameterExtension : KmTypeParameterExtensionVisitor, KmExtensio
 
 interface KmTypeExtension : KmTypeExtensionVisitor, KmExtension<KmTypeExtensionVisitor>
 
-interface KmTypeAliasExtension : KmTypeAliasExtensionVisitor, KmExtension<KmTypeExtensionVisitor>
\ No newline at end of file
+interface KmTypeAliasExtension : KmTypeAliasExtensionVisitor, KmExtension<KmTypeAliasExtensionVisitor>
+
+interface KmValueParameterExtension : KmValueParameterExtensionVisitor, KmExtension<KmValueParameterExtensionVisitor>
\ No newline at end of file
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/readers.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/readers.kt
index 99b1f2e9c03..a9f443cdeff 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/readers.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/readers.kt
@@ -282,6 +282,10 @@ private fun ProtoBuf.TypeAlias.accept(v: KmTypeAliasVisitor, outer: ReadContext)
         v.visitVersionRequirement()?.let { acceptVersionRequirementVisitor(versionRequirement, it, c) }
     }
 
+    for (extension in c.extensions) {
+        extension.readTypeAliasExtensions(v, this, c)
+    }
+
     v.visitEnd()
 }
 
@@ -294,6 +298,10 @@ private fun ProtoBuf.ValueParameter.accept(v: KmValueParameterVisitor, c: ReadCo
         v.visitVarargElementType(varargElementType.typeFlags)?.let { varargElementType.accept(it, c) }
     }
 
+    for (extension in c.extensions) {
+        extension.readValueParameterExtensions(v, this, c)
+    }
+
     v.visitEnd()
 }
 
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/writers.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/writers.kt
index 0fdded00966..52b1d7c549b 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/writers.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/impl/writers.kt
@@ -233,6 +233,11 @@ private fun writeValueParameter(
     override fun visitVarargElementType(flags: Flags): KmTypeVisitor? =
         writeType(c, flags) { t.varargElementType = it.build() }
 
+    override fun visitExtensions(type: KmExtensionType): KmValueParameterExtensionVisitor? =
+        applySingleExtension(type) {
+            writeValueParameterExtensions(type, t, c)
+        }
+
     override fun visitEnd() {
         if (flags != ProtoBuf.ValueParameter.getDefaultInstance().flags) {
             t.flags = flags
@@ -264,6 +269,11 @@ private fun writeTypeAlias(
     override fun visitVersionRequirement(): KmVersionRequirementVisitor? =
         writeVersionRequirement(c) { t.addVersionRequirement(it) }
 
+    override fun visitExtensions(type: KmExtensionType): KmTypeAliasExtensionVisitor? =
+        applySingleExtension(type) {
+            writeTypeAliasExtensions(type, t, c)
+        }
+
     override fun visitEnd() {
         if (flags != ProtoBuf.TypeAlias.getDefaultInstance().flags) {
             t.flags = flags
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/nodes.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/nodes.kt
index 053b9ae6982..9ff16a0e0ac 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/nodes.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/nodes.kt
@@ -549,6 +549,7 @@ class KmTypeAlias(
         visitor.visitExpandedType(expandedType.flags)?.let(expandedType::accept)
         annotations.forEach(visitor::visitAnnotation)
         versionRequirements.forEach { visitor.visitVersionRequirement()?.let(it::accept) }
+        extensions.forEach { visitor.visitExtensions(it.type)?.let(it::accept) }
         visitor.visitEnd()
     }
 }
@@ -573,12 +574,18 @@ class KmValueParameter(
      */
     var varargElementType: KmType? = null
 
+    private val extensions: List<KmValueParameterExtension> =
+        MetadataExtensions.INSTANCES.map(MetadataExtensions::createValueParameterExtension)
+
     override fun visitType(flags: Flags): KmTypeVisitor =
         KmType(flags).also { type = it }
 
     override fun visitVarargElementType(flags: Flags): KmTypeVisitor =
         KmType(flags).also { varargElementType = it }
 
+    override fun visitExtensions(type: KmExtensionType): KmValueParameterExtensionVisitor? =
+        extensions.singleOfType(type)
+
     /**
      * Populates the given visitor with data in this value parameter.
      *
@@ -587,6 +594,7 @@ class KmValueParameter(
     fun accept(visitor: KmValueParameterVisitor) {
         type?.let { visitor.visitType(it.flags)?.let(it::accept) }
         varargElementType?.let { visitor.visitVarargElementType(it.flags)?.let(it::accept) }
+        extensions.forEach { visitor.visitExtensions(it.type)?.let(it::accept) }
         visitor.visitEnd()
     }
 }
diff --git a/libraries/kotlinx-metadata/src/kotlinx/metadata/visitors.kt b/libraries/kotlinx-metadata/src/kotlinx/metadata/visitors.kt
index 57f43573825..97a829dd1f2 100644
--- a/libraries/kotlinx-metadata/src/kotlinx/metadata/visitors.kt
+++ b/libraries/kotlinx-metadata/src/kotlinx/metadata/visitors.kt
@@ -503,6 +503,14 @@ abstract class KmValueParameterVisitor @JvmOverloads constructor(private val del
     open fun visitVarargElementType(flags: Flags): KmTypeVisitor? =
         delegate?.visitVarargElementType(flags)
 
+    /**
+     * Visits the extensions of the given type on the value parameter.
+     *
+     * @param type the type of extension visitor to be returned
+     */
+    open fun visitExtensions(type: KmExtensionType): KmValueParameterExtensionVisitor? =
+        delegate?.visitExtensions(type)
+
     /**
      * Visits the end of the value parameter.
      */