diff --git a/ir_main.c b/ir_main.c
index 6a22531..2592ca0 100644
--- a/ir_main.c
+++ b/ir_main.c
@@ -18,7 +18,7 @@ static void help(const char *cmd)
 	printf(
 		"Usage: %s [options] input-file...\n"
 		"Options:\n"
-		"  -O[012]                    - optimiztion level\n"
+		"  -O[012]                    - optimiztion level (default: 2)\n"
 		"  -S                         - dump final target assembler code\n"
 #if defined(IR_TARGET_X86) || defined(IR_TARGET_X64)
 		"  -mavx                      - use AVX instruction set\n"