From 646deb603e0846d1efd4da84df412963dda68eec Mon Sep 17 00:00:00 2001
From: Bruce Momjian
Date: Wed, 3 Sep 2014 14:34:46 -0400
Subject: Document use of partial indexes for partial unique constraints

Report by Tomáš Greif

Backpatch through 9.4
---
 doc/src/sgml/ddl.sgml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 8ace8bd3a25..ceb83798c89 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -546,7 +546,9 @@ CREATE TABLE products (
 
    <para>
     Adding a unique constraint will automatically create a unique btree
-    index on the column or group of columns used in the constraint.
+    index on the column or group of columns used in the constraint. 
+    A uniqueness constraint on only some rows can be enforced by creating
+    a <link linkend="indexes-partial">partial index</link>.
    </para>
 
    <indexterm>
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