- * The action concatenates the 'deactivate_' prefix with the plugin's basename
- * to create a dynamically-named action.
+ * This hook is the "deactivation" hook used internally by
+ * register_deactivation_hook(). The dynamic portion of the
+ * hook name, $plugin. refers to the plugin basename.
+ *
+ * If a plugin is silently deactivated (such as during an update),
+ * this hook does not fire.