diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fe0c77a4..8db6359f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -255,7 +255,7 @@ jobs:
       - name: "Run htmltest"
         uses: wjdp/htmltest-action@master
         with:
-          config: .htmltest.yaml
+          config: .htmltest.yml
 
   build-historical-spec:
     name: "📖 Build the historical backup spec"
diff --git a/.htmltest.yaml b/.htmltest.yml
similarity index 100%
rename from .htmltest.yaml
rename to .htmltest.yml
diff --git a/changelogs/internal/newsfragments/1985.clarification b/changelogs/internal/newsfragments/1985.clarification
new file mode 100644
index 00000000..9f01fb6f
--- /dev/null
+++ b/changelogs/internal/newsfragments/1985.clarification
@@ -0,0 +1 @@
+Rename `.htmltest.yaml` to `.htmltest.yml`.