diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index ea1bce9..964068f 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -1,5 +1,5 @@
 name: Validate LaTeX Document
-on: [ push ]
+on: [ push, pull_request ]
 jobs:
   test_building_book:
     runs-on: ubuntu-latest
@@ -12,4 +12,4 @@ jobs:
           run: |
             apk add make
             cd book
-            make all
\ No newline at end of file
+            make all