diff --git a/README.md b/README.md
index b186def..41543fc 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Depends on
 
    ```python 
    MFA_UNALLOWED_METHODS=()   # Methods that shouldn't be allowed for the user
-   MFA_CALLBACK=""            # A function that should be called by username to login the user in session
+   MFA_LOGIN_CALLBACK=""      # A function that should be called by username to login the user in session
    MFA_RECHECK=True           # Allow random rechecking of the user
    MFA_RECHECK_MIN=10         # Minimum interval in seconds
    MFA_RECHECK_MAX=30         # Maximum in seconds