diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 6bfcbcc8943..a65b4bcd338 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -867,7 +867,7 @@ CREATE TABLE order_items (
   </sect2>
 
   <sect2 id="ddl-constraints-exclusion">
-   <title>Exclusion constraints</title>
+   <title>Exclusion Constraints</title>
 
    <indexterm>
     <primary>exclusion constraint</primary>