diff --git a/docs/topics/selectors.rst b/docs/topics/selectors.rst
index c841400b6..e32fc2b70 100644
--- a/docs/topics/selectors.rst
+++ b/docs/topics/selectors.rst
@@ -1032,6 +1032,9 @@ whereas the CSS lookup is translated into XPath and thus runs more efficiently,
 so performance-wise its uses are limited to situations that are not easily
 described with CSS selectors.
 
+Parsel also simplifies adding your own XPath extensions with 
+:func:`~parsel.xpathfuncs.set_xpathfunc`.
+
 .. _topics-selectors-ref:
 
 Built-in Selectors reference