diff --git a/plugins/gfm/src/main/kotlin/org/jetbrains/dokka/gfm/GfmPlugin.kt b/plugins/gfm/src/main/kotlin/org/jetbrains/dokka/gfm/GfmPlugin.kt
index 78597d445e..f3c44dac85 100644
--- a/plugins/gfm/src/main/kotlin/org/jetbrains/dokka/gfm/GfmPlugin.kt
+++ b/plugins/gfm/src/main/kotlin/org/jetbrains/dokka/gfm/GfmPlugin.kt
@@ -9,6 +9,7 @@ import org.jetbrains.dokka.gfm.location.MarkdownLocationProvider
 import org.jetbrains.dokka.gfm.renderer.BriefCommentPreprocessor
 import org.jetbrains.dokka.gfm.renderer.CommonmarkRenderer
 import org.jetbrains.dokka.plugability.DokkaPlugin
+import org.jetbrains.dokka.renderers.PostAction
 import org.jetbrains.dokka.transformers.pages.PageTransformer
 
 class GfmPlugin : DokkaPlugin() {
@@ -38,4 +39,12 @@ class GfmPlugin : DokkaPlugin() {
                 providing { PackageListCreator(it, RecognizedLinkFormat.DokkaGFM) }
                 order { after(rootCreator) })
     }
+
+    internal val alphaVersionNotifier by extending {
+        CoreExtensions.postActions providing { ctx ->
+            PostAction {
+                ctx.logger.warn("GFM output format is in Alpha version, use at your own risk, expect bugs and migration issues")
+            }
+        }
+    }
 }
diff --git a/plugins/javadoc/src/main/kotlin/org/jetbrains/dokka/javadoc/JavadocPlugin.kt b/plugins/javadoc/src/main/kotlin/org/jetbrains/dokka/javadoc/JavadocPlugin.kt
index 7f90f1ce15..a067de8411 100644
--- a/plugins/javadoc/src/main/kotlin/org/jetbrains/dokka/javadoc/JavadocPlugin.kt
+++ b/plugins/javadoc/src/main/kotlin/org/jetbrains/dokka/javadoc/JavadocPlugin.kt
@@ -14,6 +14,7 @@ import org.jetbrains.dokka.javadoc.transformers.documentables.JavadocDocumentabl
 import org.jetbrains.dokka.javadoc.validity.MultiplatformConfiguredChecker
 import org.jetbrains.dokka.kotlinAsJava.KotlinAsJavaPlugin
 import org.jetbrains.dokka.plugability.DokkaPlugin
+import org.jetbrains.dokka.renderers.PostAction
 import org.jetbrains.dokka.transformers.pages.PageTransformer
 
 class JavadocPlugin : DokkaPlugin() {
@@ -81,5 +82,13 @@ class JavadocPlugin : DokkaPlugin() {
     val deprecatedPageCreator by extending {
         javadocPreprocessors with DeprecatedPageCreator order { before(rootCreator) }
     }
+
+    internal val alphaVersionNotifier by extending {
+        CoreExtensions.postActions providing { ctx ->
+            PostAction {
+                ctx.logger.warn("Javadoc output format is in Alpha version, use at your own risk, expect bugs and migration issues")
+            }
+        }
+    }
 }
 
diff --git a/plugins/jekyll/src/main/kotlin/JekyllPlugin.kt b/plugins/jekyll/src/main/kotlin/JekyllPlugin.kt
index 4dfd21d36a..2b6d646d99 100644
--- a/plugins/jekyll/src/main/kotlin/JekyllPlugin.kt
+++ b/plugins/jekyll/src/main/kotlin/JekyllPlugin.kt
@@ -14,6 +14,7 @@ import org.jetbrains.dokka.plugability.DokkaContext
 import org.jetbrains.dokka.plugability.DokkaPlugin
 import org.jetbrains.dokka.plugability.plugin
 import org.jetbrains.dokka.plugability.query
+import org.jetbrains.dokka.renderers.PostAction
 import org.jetbrains.dokka.transformers.pages.PageTransformer
 
 class JekyllPlugin : DokkaPlugin() {
@@ -47,6 +48,14 @@ class JekyllPlugin : DokkaPlugin() {
     val locationProvider by extending {
         dokkaBase.locationProviderFactory providing ::DokkaLocationProviderFactory override listOf(gfmPlugin.locationProvider)
     }
+
+    internal val alphaVersionNotifier by extending {
+        CoreExtensions.postActions providing { ctx ->
+            PostAction {
+                ctx.logger.warn("Jekyll output format is in Alpha version, use at your own risk, expect bugs and migration issues")
+            }
+        }
+    }
 }
 
 class JekyllRenderer(
diff --git a/plugins/kotlin-as-java/src/main/kotlin/KotlinAsJavaPlugin.kt b/plugins/kotlin-as-java/src/main/kotlin/KotlinAsJavaPlugin.kt
index aae6f57046..3c204047f8 100644
--- a/plugins/kotlin-as-java/src/main/kotlin/KotlinAsJavaPlugin.kt
+++ b/plugins/kotlin-as-java/src/main/kotlin/KotlinAsJavaPlugin.kt
@@ -7,6 +7,7 @@ import org.jetbrains.dokka.kotlinAsJava.transformers.JvmNameDocumentableTransfor
 import org.jetbrains.dokka.kotlinAsJava.transformers.KotlinAsJavaDocumentableTransformer
 import org.jetbrains.dokka.kotlinAsJava.translators.KotlinAsJavaDocumentableToPageTranslator
 import org.jetbrains.dokka.plugability.DokkaPlugin
+import org.jetbrains.dokka.renderers.PostAction
 
 class KotlinAsJavaPlugin : DokkaPlugin() {
     val kotlinAsJavaDocumentableTransformer by extending {
@@ -29,4 +30,12 @@ class KotlinAsJavaPlugin : DokkaPlugin() {
         CoreExtensions.documentableToPageTranslator providing ::KotlinAsJavaDocumentableToPageTranslator override
                 plugin<DokkaBase>().documentableToPageTranslator
     }
+
+    internal val alphaVersionNotifier by extending {
+        CoreExtensions.postActions providing { ctx ->
+            PostAction {
+                ctx.logger.warn("KotlinAsJava plugin is in Alpha version, use at your own risk, expect bugs and migration issues")
+            }
+        }
+    }
 }