diff --git a/docs/hooks.txt b/docs/hooks.txt
index 0e4b423b1ac..9d066069acd 100644
--- a/docs/hooks.txt
+++ b/docs/hooks.txt
@@ -3071,8 +3071,8 @@ $specialSearch: The SpecialSearch object
 Warning: This hook is run on each display. You should consider to use
 'SkinBuildSidebar' that is aggressively cached.
 $skin: Skin object
-&$bar: Sidebar content
-  Modify $bar to add or modify sidebar portlets.
+&$sidebar: Sidebar content
+  Modify $sidebar to add or modify sidebar portlets.
 
 'SiteNoticeAfter': After the sitenotice/anonnotice is composed.
 &$siteNotice: HTML sitenotice. Alter the contents of $siteNotice to add to/alter
diff --git a/includes/HookContainer/HookRunner.php b/includes/HookContainer/HookRunner.php
index 4f30fe2fb1f..1a498df45b0 100644
--- a/includes/HookContainer/HookRunner.php
+++ b/includes/HookContainer/HookRunner.php
@@ -3424,10 +3424,10 @@ class HookRunner implements
 		);
 	}
 
-	public function onSidebarBeforeOutput( $skin, &$bar ) {
+	public function onSidebarBeforeOutput( $skin, &$sidebar ) {
 		return $this->container->run(
 			'SidebarBeforeOutput',
-			[ $skin, &$bar ]
+			[ $skin, &$sidebar ]
 		);
 	}