diff --git a/doc/index.docbook b/doc/index.docbook
index 0bef6e6..79c113c 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -1060,7 +1060,7 @@ do any harm to enable it. The default is to enable the patches.</entry>
 code update and the build process will be performed in parallel, instead of waiting for
 all of the source code updates before starting the build process.  This option defaults
 to enabling asynchronous mode.  To disable, set this option to <replaceable>false</replaceable></para>
-<para>This option is available since the 1.7 release.</para></entry>
+<para>This option is available since the 1.6 release.</para></entry>
 </row>
 
 <row id="conf-binpath">