diff --git a/.github/workflows/htmlvalidator.yml b/.github/workflows/htmlvalidator.yml
index d441179c53a..806950dce7e 100644
--- a/.github/workflows/htmlvalidator.yml
+++ b/.github/workflows/htmlvalidator.yml
@@ -14,4 +14,5 @@ jobs:
       uses: Cyb3r-Jak3/html5validator-action@v8.0.0
       with:
         root: /github/workspace/eclipse.platform.common/bundles
-        blacklist: about.html notices.html
\ No newline at end of file
+        blacklist: about.html notices.html
+        extra: --match *.html  --match *.htm
\ No newline at end of file