diff --git a/docs/reference.rst b/docs/reference.rst
index e41141bd9..3f7484979 100644
--- a/docs/reference.rst
+++ b/docs/reference.rst
@@ -80,7 +80,7 @@ Redirecting C++ streams
 
 .. doxygenfunction:: add_ostream_redirect
 
-Python build-in functions
+Python built-in functions
 =========================
 
 .. doxygengroup:: python_builtins