diff --git a/aclocal/ax_lib_event.m4 b/aclocal/ax_lib_event.m4
index 91de828..7d2f98a 100644
--- a/aclocal/ax_lib_event.m4
+++ b/aclocal/ax_lib_event.m4
@@ -141,7 +141,7 @@
 
           dnl Allow search path to be overridden on the command line.
           AC_ARG_WITH([libevent],
-                      AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent (default is yes) - it is possible to specify an alternate root directory for libevent]),
+                      AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent [default=yes]. Optionally specify the root prefix dir where libevent is installed]),
                       [
                        if test "x$withval" = "xno"; then
                          want_libevent="no"