diff --git a/README.md b/README.md
index 99fd861..d2414ca 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ A GitHub action for styling files with [prettier](prettier.io).
 
 | Parameter | Required | Default | Description |
 | - | - | - | - |
-| prettier_options | :white_check_mark: | - | Prettier options |
+| prettier_options | :x: | '--write "{,!(node_modules)/**/}*.js"' | Prettier options (by default it applies to the whole repository) |
 | commit_options | :x: | - | Custom git commit options |
 | commit_message | :x: | 'Prettified Code!' | Custom git commit message |
 | file_pattern | :x: | '*' | Custom git add file pattern |
diff --git a/action.yml b/action.yml
index 11bfb1a..784ac4a 100644
--- a/action.yml
+++ b/action.yml
@@ -17,7 +17,8 @@ inputs:
     default: '*'
   prettier_options:
     description: Options for the 'prettier' command
-    required: true
+    required: false
+    default: '--write "{,!(node_modules)/**/}*.js"'
   branch:
     description: Branch which the changes are merged to
     required: true