diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index 7b8fbcf3cac1ea..77436baecf6671 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -692,7 +692,7 @@ instead of circles.
 
 
 Special functions
--------------------------
+-----------------
 
 .. function:: erf(x)