diff --git a/sdl2.m4 b/sdl2.m4
index 302b419c0..93bc4b0f1 100644
--- a/sdl2.m4
+++ b/sdl2.m4
@@ -7,7 +7,7 @@
 
 # serial 1
 
-dnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl AM_PATH_SDL2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
 dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
 dnl
 AC_DEFUN([AM_PATH_SDL2],