diff --git a/README.md b/README.md
index 314c0828..3c577bcf 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,7 @@ Installing via Composer is highly recommended.
 
 Run the following from the root of your project:
 ```bash
+composer config allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
 composer require --dev phpcsstandards/phpcsextra:"^1.0"
 ```
 
@@ -65,6 +66,7 @@ composer require --dev phpcsstandards/phpcsextra:"^1.0"
 
 Alternatively, you may want to install this standard globally:
 ```bash
+composer global config allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
 composer global require --dev phpcsstandards/phpcsextra:"^1.0"
 ```