diff --git a/configure.in b/configure.in
index 23ae456..d6c1231 100644
--- a/configure.in
+++ b/configure.in
@@ -4,7 +4,7 @@ AC_INIT(src/Imlib2.h)
 AM_CONFIG_HEADER(config.h)
 AC_CANONICAL_SYSTEM
 mmx=no
-AC_ARG_ENABLE(mmx, "Enables building of MMX assembly routines", 
+AC_ARG_ENABLE(mmx,[  --enable-mmx          attempt compiling using mmx assembly [default=yes]],
 [
   if test x$enableval = xyes; then
     mmx=yes