diff --git a/mobiuskt-update-generator-api/api/mobiuskt-update-generator-api.api b/mobiuskt-update-generator-api/api/mobiuskt-update-generator-api.api
index 57d6d12d..69a03df8 100644
--- a/mobiuskt-update-generator-api/api/mobiuskt-update-generator-api.api
+++ b/mobiuskt-update-generator-api/api/mobiuskt-update-generator-api.api
@@ -1,3 +1,6 @@
+public abstract interface annotation class kt/mobius/gen/ExperimentalUpdateGenerator : java/lang/annotation/Annotation {
+}
+
 public abstract interface annotation class kt/mobius/gen/GenerateUpdate : java/lang/annotation/Annotation {
 }
 
diff --git a/mobiuskt-update-generator-api/build.gradle.kts b/mobiuskt-update-generator-api/build.gradle.kts
index ba7f80bd..0f0b0a95 100644
--- a/mobiuskt-update-generator-api/build.gradle.kts
+++ b/mobiuskt-update-generator-api/build.gradle.kts
@@ -24,7 +24,6 @@ kotlin {
         browser()
     }
 
-    @Suppress("UNUSED_VARIABLE")
     sourceSets {
         all {
             explicitApi()
diff --git a/mobiuskt-update-generator-api/src/commonMain/kotlin/ExperimentalUpdateGenerator.kt b/mobiuskt-update-generator-api/src/commonMain/kotlin/ExperimentalUpdateGenerator.kt
new file mode 100644
index 00000000..d3170394
--- /dev/null
+++ b/mobiuskt-update-generator-api/src/commonMain/kotlin/ExperimentalUpdateGenerator.kt
@@ -0,0 +1,4 @@
+package kt.mobius.gen
+
+@RequiresOptIn(level = RequiresOptIn.Level.WARNING)
+public annotation class ExperimentalUpdateGenerator
diff --git a/mobiuskt-update-generator-api/src/commonMain/kotlin/GenerateUpdate.kt b/mobiuskt-update-generator-api/src/commonMain/kotlin/GenerateUpdate.kt
index a18cf6e6..8d332ab5 100644
--- a/mobiuskt-update-generator-api/src/commonMain/kotlin/GenerateUpdate.kt
+++ b/mobiuskt-update-generator-api/src/commonMain/kotlin/GenerateUpdate.kt
@@ -1,5 +1,6 @@
 package kt.mobius.gen
 
+@ExperimentalUpdateGenerator
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.SOURCE)
 public annotation class GenerateUpdate
diff --git a/mobiuskt-update-generator-test/build.gradle.kts b/mobiuskt-update-generator-test/build.gradle.kts
index ccbc6322..3ed354c6 100644
--- a/mobiuskt-update-generator-test/build.gradle.kts
+++ b/mobiuskt-update-generator-test/build.gradle.kts
@@ -4,6 +4,14 @@ plugins {
     kotlin("jvm")
 }
 
+kotlin {
+    sourceSets.all {
+        languageSettings {
+            optIn("kt.mobius.gen.ExperimentalUpdateGenerator")
+        }
+    }
+}
+
 sourceSets {
     main { java.srcDir(buildDir.resolve("generated/ksp/$name/kotlin")) }
 }
diff --git a/mobiuskt-update-generator/build.gradle.kts b/mobiuskt-update-generator/build.gradle.kts
index 7b4d8db5..e5b7fac9 100644
--- a/mobiuskt-update-generator/build.gradle.kts
+++ b/mobiuskt-update-generator/build.gradle.kts
@@ -8,6 +8,7 @@ kotlin {
     sourceSets.all {
         languageSettings {
             optIn("com.squareup.kotlinpoet.ksp.KotlinPoetKspPreview")
+            optIn("kt.mobius.gen.ExperimentalUpdateGenerator")
         }
     }
 }