diff --git a/.github/workflows/filename-check.yml b/.github/workflows/filename-check.yml
index 0438b18f..d34a3d78 100644
--- a/.github/workflows/filename-check.yml
+++ b/.github/workflows/filename-check.yml
@@ -1,22 +1,17 @@
 name: Filename Check
 
-on: [push, pull_request]
+on: [push]
 
 jobs:
   check-filenames:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v3
-
-      - name: Check filenames for Windows compatibility  # currently restricted to doc folder
-        run: |
-          with_capitals=$(find doc -type f \( -iname "*.md" -o -iname "*.png" \) | grep -E '/[A-Z]')
-          # with_invalid_chars=$(find . -type f | grep -E '[<>:"/\\|?*]|[[:cntrl:]]')
-          # if [ ! -z "$with_capitals" ] || [ ! -z "$with_invalid_chars" ]; then
-          if [ ! -z "$with_capitals" ]; then
-            echo "The following files do not follow the naming convention:"
-            [ ! -z "$with_capitals" ] && echo "Files with capitals:" && echo "$with_capitals"
-            # [ ! -z "$with_invalid_chars" ] && echo "Files with Windows-restricted characters:" && echo "$with_invalid_chars"
-            exit 1
-          fi
+    - uses: actions/checkout@v2
+    - name: Check for capital letters in filenames in 'doc/manual'
+      run: |
+        files_with_caps=$(find doc/manual -type f | grep '[A-Z]')
+        if [ ! -z "$files_with_caps" ]; then
+          echo "Files with capital letters:"
+          echo "$files_with_caps"
+          exit 1
+        fi