diff --git a/docs/hooks.txt b/docs/hooks.txt
index a6d6c6c08ef..c528b5f7d7e 100644
--- a/docs/hooks.txt
+++ b/docs/hooks.txt
@@ -1733,7 +1733,7 @@ blocks can be seen using CompositeBlock::getOriginalBlocks()
 $user: User targeted by the block
 $ip: string|null The IP of the current request if $user is the current user
   and they're not exempted from IP blocks. Null otherwise.
-&$block: AbstractBlock object
+&$block: AbstractBlock|null The user's block, or null if none was found.
 
 'getUserPermissionsErrors': Add a permissions error when permissions errors are
 checked for. Use instead of userCan for most cases. Return false if the user