diff --git a/bin/generate-gutenberg-php.php b/bin/generate-gutenberg-php.php
index da7872214379c8..fc9bf51ef3cab5 100755
--- a/bin/generate-gutenberg-php.php
+++ b/bin/generate-gutenberg-php.php
@@ -40,13 +40,13 @@ function print_production_defines() {
 	}
 
 	switch ( trim( $line ) ) {
-		case '### BEGIN DEFINES':
+		case '### BEGIN AUTO-GENERATED DEFINES':
 			$inside_defines = true;
 			echo $line;
 			print_production_defines();
 			break;
 
-		case '### END DEFINES':
+		case '### END AUTO-GENERATED DEFINES':
 			$inside_defines = false;
 			echo $line;
 			break;
diff --git a/gutenberg.php b/gutenberg.php
index 919dcac47f0f0b..755f128a3a6eda 100644
--- a/gutenberg.php
+++ b/gutenberg.php
@@ -11,9 +11,9 @@
 
 define( 'GUTENBERG__PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 
-### BEGIN DEFINES
+### BEGIN AUTO-GENERATED DEFINES
 define( 'GUTENBERG_DEVELOPMENT_MODE', true );
-### END DEFINES
+### END AUTO-GENERATED DEFINES
 
 require_once dirname( __FILE__ ) . '/lib/blocks.php';
 require_once dirname( __FILE__ ) . '/lib/client-assets.php';