diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 19fa7fa..a5afc74 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -1,6 +1,8 @@
 # For help debugging build failures open an issue on the RStudio community with the 'github-actions' tag.
 # https://community.rstudio.com/new-topic?category=Package%20development&tags=github-actions
-on: push
+on: 
+  push:
+  pull_request:
 name: R-CMD-check
 
 jobs:
@@ -71,3 +73,4 @@ jobs:
         with:
           name: ${{ runner.os }}-r${{ matrix.config.r }}-results
           path: check
+