Index: bitbake/doc/manual/usermanual.xml
===================================================================
--- bitbake/doc/manual/usermanual.xml (revision 1152)
+++ bitbake/doc/manual/usermanual.xml (working copy)
@@ -89,6 +89,11 @@
<para>This results in <varname>A</varname> containing
<literal>aval</literal> and <varname>B</varname> containing
<literal>preavalpost</literal>.</para>
</section>
<section>
+ <title>Setting a default value (?=)</title>
+ <para><screen><varname>A</varname> ?= "aval"</screen></para>
+ <para>If <varname>A</varname> is set before the above is
called, it will retain it's previous value. If <varname>A</varname> is unset
prior to the above call, <varname>A</varname> will be set to
<literal>aval</literal>.</para>
+ </section>
+ <section>
<title>Immediate variable expansion (:=)</title>
<para>:= results in a variable's contents being expanded
immediately, rather than when the variable is actually used.</para>
<para><screen><varname>T</varname> = "123"
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