diff --git a/src/tclscripts/helplib.tcl b/src/tclscripts/helplib.tcl
index e87a44e43b5..c828fc277a9 100644
--- a/src/tclscripts/helplib.tcl
+++ b/src/tclscripts/helplib.tcl
@@ -120,7 +120,7 @@ set helplib_data(wdb_reopen)		{{[filename]} {open a database}}
 set helplib_data(wdb_rt_gettrees)	{{procname [-i] [-u] treetops...} {create an rt instance object}}
 set helplib_data(wdb_search)		{{[path] [options]} {search database for objects matching parameters defined by options within the specified path}}
 set helplib_data(wdb_shells)		{{nmg_model}	{breaks model into separate shells}}
-set helplib_data(wdb_showmats)		{{path}	{show xform matrices along path}}
+set helplib_data(wdb_showmats)		{{[-a] path}	{show xform matrices along path}}
 set helplib_data(wdb_bot_smooth)        {{[-t norm_tolerance_degrees] new_bot_name old_bot_name} {calculate vertex normals for BOT primitive}}
 set helplib_data(wdb_summary)		{{[p r g]}	{count/list primitives/regions/groups}}
 set helplib_data(wdb_title)		{{description} {set/get database title}}