diff --git a/docs/manual/mod/mod_log_debug.html.en b/docs/manual/mod/mod_log_debug.html.en

index d3d4bd7..1ffd37f 100644

--- a/docs/manual/mod/mod_log_debug.html.en

+++ b/docs/manual/mod/mod_log_debug.html.en

@@ -61,7 +61,7 @@

         Log message if request to /foo/* is processed in a sub-request:

 <Location /foo/>

-  LogMessage "subrequest to /foo/" hook=type_checker expr=%{IS_SUBREQ}

+  LogMessage "subrequest to /foo/" hook=type_checker "expr=-T %{IS_SUBREQ}"

 </Location>