diff --git a/action.yml b/action.yml
index 6a85395b..37d707ed 100644
--- a/action.yml
+++ b/action.yml
@@ -85,9 +85,10 @@ inputs:
     default: ""
   
   # Rendered metrics output path, relative to repository's root
+  # When using "*", the correct extension will automatically on "config_output" value
   filename:
     description: Rendered metrics output path
-    default: github-metrics.svg
+    default: github-metrics.*
   
   # Rendered markdown output path (when using a markdown template)
   # It can be either a local path or a link (e.g. raw.githubusercontent.com)