diff --git a/pytools/tag.py b/pytools/tag.py
index a125a1127b5f62d31dfbf9d6e4d7ca63c1f894ba..b943d954fc48fcb03b0d78bd7d291d566c8d78ef 100644
--- a/pytools/tag.py
+++ b/pytools/tag.py
@@ -129,7 +129,7 @@ class Tag:
 
 class UniqueTag(Tag):
     """
-    A superclass for tags that are unique on each `Taggable`.
+    A superclass for tags that are unique on each :class:`Taggable`.
 
     Each instance of :class:`Taggable` may have no more than one
     instance of each subclass of :class:`UniqueTag` in its