diff --git a/README.md b/README.md
index 4aa551a..7e37dc1 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,8 @@ bar:abc:1002:100
 baz:xyz:1003:100
 ```
 
+Tip: you **MUST** use LF for end of line and **NOT** CRLF
+
 ## Encrypted password
 
 Add `:e` behind password to mark it as encrypted. Use single quotes if using terminal.