diff --git a/.github/workflows/diagrams.yml b/.github/workflows/diagrams.yml
index 6d9d0413..fc3494c0 100644
--- a/.github/workflows/diagrams.yml
+++ b/.github/workflows/diagrams.yml
@@ -1,8 +1,11 @@
 name: Generate PlantUML Diagrams
-on: push
+on:
+  pull_request:
+    paths:
+      - 'diagrams/**.puml'
+
 permissions:
   contents: write
-
 jobs:
   generate_plantuml:
     runs-on: ubuntu-latest