Small patch to sh.1

[Doug Barton]

Does the attached patch look reasonable?

Doug

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Index: sh.1
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RCS file: /usr/local/ncvs/src/bin/sh/sh.1,v
retrieving revision 1.118
diff -u -r1.118 sh.1
--- sh.1	1 Jan 2006 16:02:12 -0000	1.118
+++ sh.1	7 Jan 2006 01:25:57 -0000
@@ -1140,6 +1140,10 @@
 .Pp
 In addition, a parameter expansion can be modified by using one of the
 following formats.
+For each of the formats below,
+if the colon is ommitted the expansion will only be modified
+if the parameter is unset.
+It will not be modified if the parameter is null.
 .Bl -tag -width indent
 .It Li ${parameter:-word}
 Use Default Values.