diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 48ef626..48a41c3 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -1,4 +1,5 @@
 - [ ] goldmark is fully compliant with the CommonMark. Before submitting issue, you **must** read [CommonMark spec](https://spec.commonmark.org/0.29/) and confirm your output is different from [CommonMark online demo](https://spec.commonmark.org/dingus/).
+- [ ] Before you make a feature request, **you should consider implement the new feature as an extension by yourself** . To keep goldmark itself simple, most new features should be implemented as an extension.
 
 Please answer the following before submitting your issue:
 
@@ -8,3 +9,4 @@ Please answer the following before submitting your issue:
 4. What did you do? :
 5. What did you expect to see? :
 6. What did you see instead? :
+7. (Feature request only): Why you can not implement it as an extension?: