diff --git a/configure.ac b/configure.ac
index d4ebd0d45..edd9e72d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1164,7 +1164,7 @@ AC_SUBST(plugindir)
 AC_SUBST(PLUGINDIR)
 
 AC_ARG_WITH(gl-driver,
-	[  --with-gl-driver        default gl dynamic lib name],
+	[  --with-gl-driver=NAME   Name of OpenGL driver DLL/DSO],
 	gl_driver=$withval,
 	gl_driver=auto
 )