diff --git a/README.md b/README.md
index b2dce84f583fcde0e74cf4ec6b5c2d2f9539478c..dee11929616c9bbbd8ed815426c4f1c2c22aa35a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 
 1. Run `git commit`
 2. Run `git cat-file commit HEAD`
-3. Modify the `catfile_text`, 
+3. Modify the `catfile_text` and `commit_msg` in `main()` , also modify the hash condition `if(unlikely(*(uint16_t *)hashbuf == 0))`. 
+4. build and run
+5. Run `git reset HEAD~1` and then commit with the result.