diff --git a/ciphers/a1z26.py b/ciphers/a1z26.py
index a1377ea6d397..1875d89a9bbd 100644
--- a/ciphers/a1z26.py
+++ b/ciphers/a1z26.py
@@ -1,4 +1,4 @@
-"""
+"""(1-based)
 Convert a string of characters to a sequence of numbers
 corresponding to the character's position in the alphabet.