clarify suffix characters comments
@@ -16,8 +16,9 @@ from tornado.httputil import url_concat
from .base import BaseHandler
# Add a random lowercase alphanumeric suffix to usernames to avoid collisions
+# Set of characters from which to generate a suffix
SUFFIX_CHARS = string.ascii_lowercase + string.digits
-# 36**8 ~= 2**41
+# Set length of suffix. Number of combinations = SUFFIX_CHARS**SUFFIX_LENGTH = 36**8 ~= 2**41
SUFFIX_LENGTH = 8
class RedirectHandler(BaseHandler):
