diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..6bfa41b
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,3 @@
+- Write in camelCase, not snake_case.
+- Do not push to master/main without testing your changes first, make a branch
+  if you have to.