diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2e8650b..09e4859 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,6 +6,19 @@
 - Don't forget to run `npm run lint` and `npm test` before submitting pull requests.
 - Make sure that **100%** of your code is covered by tests.
 
+**Contributing new features **
+
+- To ensure that there are no conflicts when merging the branch into the main branch, 
+- it is necessary to perform the following steps each time new development is going to be conducted on non-main branches:
+- `git pull`, 
+- `git rebase main`
+- resolve conflicts before continuing the development.
+- After new features developed
+- `git add .`
+- `git commit -m [rbtree] features` (`rbtree` needs to be replaced by the module you have modified, 
+- `features` must be replaced by the detailed description about the features you implemented)
+- `git push`
+- click the `New pull request` on Github https://github.com/zrwusa/data-structure-typed/branches
 
 **Contributing New Data Structures**