diff --git a/doc/src/sgml/charset.sgml b/doc/src/sgml/charset.sgml
index 1b00e543a6..300a0d83d4 100644
--- a/doc/src/sgml/charset.sgml
+++ b/doc/src/sgml/charset.sgml
@@ -346,7 +346,8 @@ initdb --locale=sv_SE
     collation.  (The built-in collatable data types are
     <type>text</type>, <type>varchar</type>, and <type>char</type>.
     User-defined base types can also be marked collatable, and of course
-    a domain over a collatable data type is collatable.)  If the
+    a <link linkend="domains">domain</link> over a collatable data type
+    is collatable.)  If the
     expression is a column reference, the collation of the expression is the
     defined collation of the column.  If the expression is a constant, the
     collation is the default collation of the data type of the