diff --git a/includes/deferred/MWCallableUpdate.php b/includes/deferred/MWCallableUpdate.php
index 0f241fc32cb..8239d4f1eb4 100644
--- a/includes/deferred/MWCallableUpdate.php
+++ b/includes/deferred/MWCallableUpdate.php
@@ -25,7 +25,7 @@ class MWCallableUpdate
 	 * @param callable $callback One of the following:
 	 *    - A Closure callback that takes the caller name as its argument
 	 *    - A non-Closure callback that takes no arguments
-	 * @param string $fname Calling method
+	 * @param string $fname Calling method @phan-mandatory-param
 	 * @param IDatabase|IDatabase[] $dependeeDbws DB handles which might have pending writes
 	 *  upon which this update depends. If any of the handles already has an open transaction,
 	 *  a rollback thereof will cause this update to be cancelled (if it has not already run).
diff --git a/includes/deferred/TransactionRoundDefiningUpdate.php b/includes/deferred/TransactionRoundDefiningUpdate.php
index 0054872cfac..d6efad07970 100644
--- a/includes/deferred/TransactionRoundDefiningUpdate.php
+++ b/includes/deferred/TransactionRoundDefiningUpdate.php
@@ -19,7 +19,7 @@ class TransactionRoundDefiningUpdate
 
 	/**
 	 * @param callable $callback
-	 * @param string $fname Calling method
+	 * @param string $fname Calling method @phan-mandatory-param
 	 */
 	public function __construct( callable $callback, $fname = ISQLPlatform::CALLER_UNKNOWN ) {
 		$this->callback = $callback;