diff --git a/kotlin-code-generation/src/main/kotlin/poet/AnnotationSpecBuilder.kt b/kotlin-code-generation/src/main/kotlin/poet/AnnotationSpecBuilder.kt
index 69f36e7..cf2de7c 100644
--- a/kotlin-code-generation/src/main/kotlin/poet/AnnotationSpecBuilder.kt
+++ b/kotlin-code-generation/src/main/kotlin/poet/AnnotationSpecBuilder.kt
@@ -13,12 +13,21 @@ class AnnotationSpecBuilder(
   AnnotationSpecSupplier,
   PoetTaggableBuilder<AnnotationSpecBuilder> {
   companion object {
-    fun AnnotationSpec.Builder.wrap() = AnnotationSpecBuilder(this)
+    internal fun AnnotationSpec.Builder.wrap() = AnnotationSpecBuilder(this)
 
+    /**
+     * Creates new builder.
+     */
     fun builder(type: ClassName): AnnotationSpecBuilder = AnnotationSpec.builder(type).wrap()
 
+    /**
+     * Creates new builder.
+     */
     fun builder(type: ParameterizedTypeName): AnnotationSpecBuilder = AnnotationSpec.builder(type).wrap()
 
+    /**
+     * Creates new builder.
+     */
     fun builder(type: KClass<out Annotation>): AnnotationSpecBuilder = builder(type.asClassName())
   }