diff --git a/configure.in b/configure.in
index 3fe6d58..44eac9e 100644
--- a/configure.in
+++ b/configure.in
@@ -158,8 +158,8 @@ if test "x$HAVE_OPENGL" != xno; then
 		AC_CHECK_LIB(GL, glBegin,
 			OPENGL_LIBS="$OPENGL_LIBS -lGL"
 			HAVE_OPENGL=yes,
-			dnl add -lX11 and -lXext on FreeBSD if the first
-			dnl  test failed
+			dnl add -lX11 and -lXext if the first test failed
+			dnl (for, e.g. FreeBSD)
 			unset ac_cv_lib_GL_glBegin
 			AC_CHECK_LIB(GL, glBegin,
 				OPENGL_LIBS="$OPENGL_LIBS -lX11 -lXext"