diff --git a/scalabot-extension/src/main/java/net/lamgc/scalabot/extension/BotExtensionFactory.java b/scalabot-extension/src/main/java/net/lamgc/scalabot/extension/BotExtensionFactory.java
index a374d09..842d2af 100644
--- a/scalabot-extension/src/main/java/net/lamgc/scalabot/extension/BotExtensionFactory.java
+++ b/scalabot-extension/src/main/java/net/lamgc/scalabot/extension/BotExtensionFactory.java
@@ -37,7 +37,7 @@ public interface BotExtensionFactory {
      */
     @Deprecated(since = "0.7.0", forRemoval = true)
     default AbilityExtension createExtensionInstance(BaseAbilityBot bot, File shareDataFolder) {
-        throw new UnsupportedOperationException();
+        throw new UnsupportedOperationException("The method has not been implemented.");
     }
 
     /**