diff --git a/docs/library/ure.rst b/docs/library/ure.rst
index 67f4f54a1d..ebae1db5f1 100644
--- a/docs/library/ure.rst
+++ b/docs/library/ure.rst
@@ -34,6 +34,8 @@ Supported operators are:
 
 ``'+?'``
 
+``'|'``
+
 ``'()'``
    Grouping. Each group is capturing (a substring it captures can be accessed
    with `match.group()` method).