diff --git a/mu808asm.py b/mu808asm.py
index b93810a..2ee8b56 100755
--- a/mu808asm.py
+++ b/mu808asm.py
@@ -162,7 +162,7 @@ def ti74data(txtrep:str, baseaddr:int=5000):
 
 def main():
     if len(sys.argv) < 4:
-        print("Usage: mu808asm [at|ab|dt|db|t2b|b2t] file outfile")
+        print("Usage: mu808asm [at|ab|dt|db|t2b|b2t|t74] file outfile")
         return
     mode = sys.argv[1]
     srcfile = sys.argv[2]