diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d3a510d..05da5ea 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -27,6 +27,20 @@ jobs:
           github_token: ${{ secrets.github_token }}
           reporter: github-pr-check
           level: info
+  test-pr-change-check:
+    if: github.event_name == 'pull_request'
+    name: runner / languagetool (github-pr-check) (Changed)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: ./
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-check
+          level: info
+          base_ref: develop
 
   test-pr-review:
     if: github.event_name == 'pull_request'
@@ -40,4 +54,4 @@ jobs:
           reporter: github-pr-review
           level: info
           patterns: "**.md"
-          custom_api_endpoint: https://languagetool.org/api
+          custom_api_endpoint: https://languagetool.org/api
\ No newline at end of file
diff --git a/action.yml b/action.yml
index 0339dd4..6b3113e 100644
--- a/action.yml
+++ b/action.yml
@@ -37,6 +37,9 @@ inputs:
   custom_api_endpoint:
     description: 'Custom API endpoint of LanguageTool server. e.g. https://languagetool.org/api'
     default: ''
+  base_ref:
+    description: 'The branch or commit reference that files changed or added should be collected from. Will use the default branch if coming from a pull request if not set.'
+    default: ''
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
index 0676333..a30201d 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -36,7 +36,11 @@ fi
 
 # Disable glob to handle glob patterns with ghglob command instead of with shell.
 set -o noglob
-FILES="$(git ls-files | ghglob ${INPUT_PATTERNS})"
+if [ -n "${INPUT_BASE_REF}" ]; then
+  FILES="$(git diff "origin/${INPUT_BASE_REF}" --name-only | ghglob "${INPUT_PATTERNS}")"
+else
+  FILES="$(git ls-files | ghglob "${INPUT_PATTERNS}")"
+fi
 set +o noglob
 
 # To manage whitespaces in filepath