diff --git a/bots/zephyr_mirror_backend.py b/bots/zephyr_mirror_backend.py
index 98c1664634..77148d313c 100755
--- a/bots/zephyr_mirror_backend.py
+++ b/bots/zephyr_mirror_backend.py
@@ -370,7 +370,7 @@ def process_notice(notice, log):
     if is_personal:
         if body.startswith("CC:"):
             is_huddle = True
-            # Map "CC: sipbtest espuser" => "starnine@mit.edu,espuser@mit.edu"
+            # Map "CC: user1 user2" => "user1@mit.edu, user2@mit.edu"
             huddle_recipients = [to_zulip_username(x.strip()) for x in
                                  body.split("\n")[0][4:].split()]
             if notice.sender not in huddle_recipients:
diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index c74f980a9a..01fce45ce9 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -352,7 +352,7 @@ def compute_jabber_user_fullname(email):
 
 def compute_mit_user_fullname(email):
     try:
-        # Input is either e.g. starnine@mit.edu or user|CROSSREALM.INVALID@mit.edu
+        # Input is either e.g. username@mit.edu or user|CROSSREALM.INVALID@mit.edu
         match_user = re.match(r'^([a-zA-Z0-9_.-]+)(\|.+)?@mit\.edu$', email.lower())
         if match_user and match_user.group(2) is None:
             answer = DNS.dnslookup(