diff --git a/src/wp-includes/plugin.php b/src/wp-includes/plugin.php
index 5581196696..7f6217dedf 100644
--- a/src/wp-includes/plugin.php
+++ b/src/wp-includes/plugin.php
@@ -50,7 +50,7 @@ if ( ! isset( $wp_current_filter ) )
  *
  *     function example_callback( $example ) {
  *         // Maybe modify $example in some way.
- *     	   return $example;
+ *         return $example;
  *     }
  *     add_filter( 'example_filter', 'example_callback' );
  *