From f71b5c77fa0015492a26838eb489293effee1723 Mon Sep 17 00:00:00 2001
From: Bruce Momjian
Date: Mon, 9 May 2011 21:04:22 -0400
Subject: 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(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 4852231141e..83adc33333b 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">
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