[#2710] fixed underline

diff --git a/doc/sphinx/arm/admin.rst b/doc/sphinx/arm/admin.rst
index a0f5749d2d4fd8ec44bc5b9f61fbdf10cac4bea0..a38ba92252ee4b6ec4589cbeaa4dbedcd98d1287 100644 (file)
--- a/doc/sphinx/arm/admin.rst
+++ b/doc/sphinx/arm/admin.rst
@@ -610,7 +610,7 @@ supported:
 .. _pgsql-performance:
 
 Improved Performance With PostgreSQL
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Changing the PostgreSQL internal value ``synchronous_commit`` from the default value
 of ON to OF can result in gain in Kea performance. On slow systems, the gain can be over 1000%.