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README.md

@@ -80,9 +80,18 @@ export MAIL="marvin@student.42lausanne.ch"
 
 ### **Note**
 
-Your git username and email will always have the priority to $USER and $MAIL variable
-if you are outside a git tree and $USER and $MAIL are not defined it will use the
-default marvin@student.42lausanne.ch as email and marvin as login for your header.
+- Your git username and email will always have the priority over $USER and $MAIL variables.
+- if you are outside a git repo tree, it will use the $USER and $MAIL environement variables.
+- if none of the above, it will default to marvin@student.42lausanne.ch and marvin as username.
+
+Troubleshooting:
+```
+git config user.name
+git config user.email
+echo $USER
+echo $MAIL
+grep -e 'USER=' -e 'MAIL=' ~/.zshrc
+```
 
 The location of this alternative version of stdheader.vim:
 - ~/.vim/plugin/stdheader.vim