From 832c095d686e89f6390e0ff3e91b4c8015c2c3f7 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 9 May 2011 21:04:18 -0400
Subject: [PATCH] Update documentation to state there is three-value logic, not
 three-value boolean logic.

Backpatch to 9.0.X since we just got another bug report about this
today.
---
 doc/src/sgml/func.sgml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 657835c701..c1a34fb169 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -82,8 +82,9 @@
      <member><literal>NOT</></member>
     </simplelist>
 
-    <acronym>SQL</acronym> uses a three-valued Boolean logic where the null value represents
-    <quote>unknown</quote>.  Observe the following truth tables:
+    <acronym>SQL</acronym> uses a three-valued logic system with true,
+    false, and <literal>null</>, which represents <quote>unknown</quote>.
+    Observe the following truth tables:
 
     <informaltable>
      <tgroup cols="4">
-- 
2.40.0