diff --git a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/declarations/PackageMemberDeclarationProvider.kt b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/declarations/PackageMemberDeclarationProvider.kt
index 7f200b7b119..c87db23831a 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/declarations/PackageMemberDeclarationProvider.kt
+++ b/compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/declarations/PackageMemberDeclarationProvider.kt
@@ -22,6 +22,9 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 
 public trait PackageMemberDeclarationProvider : DeclarationProvider {
+    /**
+     * Implementation of this method are not obliged to use the filters but may do so when it gives any performance advantage
+     */
     public fun getAllDeclaredSubPackages(nameFilter: (Name) -> Boolean): Collection<FqName>
 
     public fun getPackageFiles(): Collection<JetFile>