diff --git a/bin/generate-gutenberg-php.php b/bin/generate-gutenberg-php.php
index 4ed6b661a21c23..e976b2da8d0fcb 100755
--- a/bin/generate-gutenberg-php.php
+++ b/bin/generate-gutenberg-php.php
@@ -15,6 +15,8 @@
 /**
  * Prints `define` statements for the production version of `gutenberg.php`
  * (the plugin entry point).
+ * 
+ * @global string $plugin_version The version number of the plugin, parsed from the `gutenberg.php` file.
  */
 function print_production_defines() {
 	global $plugin_version;