diff --git a/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotated.kt b/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotated.kt
index b90d5b75683..d093128b610 100644
--- a/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotated.kt
+++ b/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotated.kt
@@ -7,18 +7,41 @@ package org.jetbrains.kotlin.analysis.api.annotations
 
 import org.jetbrains.kotlin.name.ClassId
 
+/**
+ * Entity which may have annotations applied inside. E.g, type or declaration
+ */
 public interface KtAnnotated {
     public val annotationsList: KtAnnotationsList
 }
 
+/**
+ * A list of annotations applied.
+ *
+ * @see [KtAnnotationsList.annotations]
+ */
 public val KtAnnotated.annotations: List<KtAnnotationApplication>
     get() = annotationsList.annotations
 
+/**
+ * Checks if entity contains annotation with specified [classId].
+ *
+ * @see [KtAnnotationsList.containsAnnotation]
+ */
 public fun KtAnnotated.containsAnnotation(classId: ClassId): Boolean =
     annotationsList.containsAnnotation(classId)
 
+/**
+ * A list of annotations applied with specified [classId].
+ *
+ * @see [KtAnnotationsList.annotationClassIds]
+ */
 public fun KtAnnotated.annotationsByClassId(classId: ClassId): List<KtAnnotationApplication> =
     annotationsList.annotationsByClassId(classId)
 
+/**
+ * A list of annotations applied.
+ *
+ * @see [KtAnnotationsList.annotationClassIds]
+ */
 public val KtAnnotated.annotationClassIds: Collection<ClassId>
     get() = annotationsList.annotationClassIds
\ No newline at end of file
diff --git a/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotationsList.kt b/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotationsList.kt
index 8d09d55af78..12276cc867d 100644
--- a/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotationsList.kt
+++ b/analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/annotations/KtAnnotationsList.kt
@@ -8,10 +8,55 @@ package org.jetbrains.kotlin.analysis.api.annotations
 import org.jetbrains.kotlin.analysis.api.ValidityTokenOwner
 import org.jetbrains.kotlin.name.ClassId
 
+/**
+ * A list of annotations applied for some entity.
+ *
+ * Annotation owners are usually implement [KtAnnotated]
+ */
 public abstract class KtAnnotationsList : ValidityTokenOwner {
+    /**
+     * A list of annotations applied.
+     *
+     * To check if annotation is present, please use [containsAnnotation].
+     *
+     * @see KtAnnotationApplication
+     */
     public abstract val annotations: List<KtAnnotationApplication>
+
+    /**
+     * Checks if entity contains annotation with specified [classId].
+     *
+     * The semantic is equivalent to
+     * ```
+     * annotationsList.containsAnnotation(classId) == annotationsList.annotations.any { it.classId == classId }
+     * ```
+     */
     public abstract fun containsAnnotation(classId: ClassId): Boolean
+
+    /**
+     * A list of annotations applied with specified [classId].
+     *
+     * To check if annotation is present, please use [containsAnnotation].
+     *
+     * The semantic is equivalent to
+     * ```
+     * annotationsList.annotationsByClassId(classId) == annotationsList.annotations.filter { it.classId == classId }
+     * ```
+     *
+     * @see KtAnnotationApplication
+     */
     public abstract fun annotationsByClassId(classId: ClassId): List<KtAnnotationApplication>
+
+    /**
+     * A list of annotations [ClassId].
+     *
+     * To check if annotation is present, please use [containsAnnotation].
+     *
+     * The semantic is equivalent to
+     * ```
+     * annotationsList.annotationClassIds == annotationsList.annotations.map { it.classId }
+     * ```
+     */
     public abstract val annotationClassIds: Collection<ClassId>
 }