diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b155556..de8a1e0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -53,6 +53,17 @@ jobs:
             test/*.sql
             test/**/*.txt
             test/**/*.sql
+      - name: Test fail if changed
+        uses: ./
+        id: unchanged_files_expected_fail
+        continue-on-error: true
+        with:
+          fail-if-unchanged: true
+          files: |
+            test/*.txt
+            test/*.sql
+            test/**/*.txt
+            test/**/*.sql
       - name: Make changes
         run: |
           printf '%s\n' "323442" "424" >> test/new.txt
@@ -99,6 +110,16 @@ jobs:
             test/*.sql
             test/**/*.txt
             test/**/*.sql
+      - name: Test dont fail if changed and fail-if-unchanged is true
+        uses: ./
+        id: unchanged_files_not_expected_fail
+        with:
+          fail-if-unchanged: true
+          files: |
+            test/*.txt
+            test/*.sql
+            test/**/*.txt
+            test/**/*.sql
       - name: Generate an unstaged file
         run: |
           echo "New changes" > unstaged.txt
diff --git a/README.md b/README.md
index 9d57cf2..89e6c61 100644
--- a/README.md
+++ b/README.md
@@ -243,4 +243,4 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
\ No newline at end of file
diff --git a/action.yml b/action.yml
index ce0d099..604e0cf 100644
--- a/action.yml
+++ b/action.yml
@@ -25,9 +25,13 @@ inputs:
     description: 'Indicates whether to fail if files have changed.'
     default: "false"
     required: false
+  fail-if-unchanged:
+    description: 'Indicates whether to fail if no files have changed.'
+    default: "false"
+    required: false
   fail-message:
-    description: 'Message to display when files have changed and the `fail-if-changed` input is set to `true`.'
-    default: "Files have changed."
+    description: 'Message to display when `fail-if-changed` or `fail-if-unchanged` is set to `true`.'
+    default: ""
     required: false
   safe_output:
     description: "Apply sanitization to output filenames before being set as output."
@@ -65,6 +69,7 @@ runs:
         read-gitignore: ${{ inputs.read-gitignore }}
         match-gitignore-files: ${{ inputs.match-gitignore-files }}
         safe-output: ${{ inputs.safe_output }}
+      
     - run: |
         bash $GITHUB_ACTION_PATH/entrypoint.sh
       id: verify-changed-files
@@ -78,7 +83,8 @@ runs:
         INPUT_SEPARATOR: ${{ inputs.separator }}
         INPUT_MATCH_GITIGNORE_FILES: ${{ inputs.match-gitignore-files }}
         INPUT_FAIL_IF_CHANGED: ${{ inputs.fail-if-changed }}
-        INPUT_FAIL_MSG: ${{ inputs.fail-message }}
+        INPUT_FAIL_IF_UNCHANGED: ${{ inputs.fail-if-unchanged }}
+        INPUT_FAIL_MSG: ${{ inputs.fail-message || (inputs.fail-if-changed == 'true' && 'Files have changed.' || 'Files have not changed.') }}
         INPUT_SAFE_OUTPUT: ${{ inputs.safe_output }}
         INPUT_PATH: ${{ inputs.path }}
         INPUT_QUOTEPATH: ${{ inputs.quotepath }}
diff --git a/entrypoint.sh b/entrypoint.sh
index 3172a0a..2c66d12 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -97,6 +97,13 @@ if [[ -n "$CHANGED_FILES" ]]; then
 else
   echo "No changes found."
   echo "files_changed=false" >> "$GITHUB_OUTPUT"
+  
+  if [[ "$INPUT_FAIL_IF_UNCHANGED" == "true" ]]; then
+      if [[ -n "$INPUT_FAIL_MSG" ]]; then
+        echo "$INPUT_FAIL_MSG"
+      fi
+      exit 1
+  fi
 fi
 
 echo "::endgroup::"