diff --git a/bots/gcal-bot b/bots/gcal-bot
index 30dae5f..03e2c52 100755
--- a/bots/gcal-bot
+++ b/bots/gcal-bot
@@ -14,10 +14,10 @@ import humbug
 parser = optparse.OptionParser(r"""
 
 %prog \
-    --user foo@humbughq.com \
-    --calendar http://www.google.com/calendar/feeds/foo%40humbughq.com/private-fedcba9876543210fedcba9876543210/basic
+    --user foo@zulip.com \
+    --calendar http://www.google.com/calendar/feeds/foo%40zulip.com/private-fedcba9876543210fedcba9876543210/basic
 
-    Send yourself reminders on Humbug of Google Calendar events.
+    Send yourself reminders on Zulip of Google Calendar events.
 
     To get the calendar URL:
       - Load Google Calendar in a web browser
diff --git a/demos/twitter-search-bot b/demos/twitter-search-bot
index 2aa5d7d..364d462 100755
--- a/demos/twitter-search-bot
+++ b/demos/twitter-search-bot
@@ -17,7 +17,7 @@ def write_config(config, since_id):
 
 parser = optparse.OptionParser(r"""
 
-%prog --user foo@humbughq.com --api-key a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --search="@nprnews,quantum physics"
+%prog --user foo@zulip.com --api-key a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --search="@nprnews,quantum physics"
 
 Send Twitter search results to a Humbug stream.
 
diff --git a/examples/list-subscriptions b/examples/list-subscriptions
index 64e2a9b..b9c90a7 100755
--- a/examples/list-subscriptions
+++ b/examples/list-subscriptions
@@ -29,7 +29,7 @@ usage = """list-subscriptions --user=<bot's email address> --api-key=<bot's api
 
 Prints out a list of the user's subscriptions.
 
-Example: list-subscriptions --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
+Example: list-subscriptions --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
 
 You can omit --user and --api-key arguments if you have a properly set up ~/.humbugrc
 """
diff --git a/examples/print-messages b/examples/print-messages
index 58acedc..8dc40b4 100755
--- a/examples/print-messages
+++ b/examples/print-messages
@@ -29,7 +29,7 @@ usage = """print-messages --user=<bot's email address> --api-key=<bot's api key>
 
 Prints out each message received by the indicated bot or user.
 
-Example: print-messages --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
+Example: print-messages --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
 
 You can omit --user and --api-key arguments if you have a properly set up ~/.humbugrc
 """
diff --git a/examples/print-next-message b/examples/print-next-message
index 342e9cf..b7af91e 100755
--- a/examples/print-next-message
+++ b/examples/print-next-message
@@ -29,7 +29,7 @@ usage = """print-next-message --user=<bot's email address> --api-key=<bot's api
 
 Prints out the next message received by the user.
 
-Example: print-next-messages --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
+Example: print-next-messages --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
 
 You can omit --user and --api-key arguments if you have a properly set up ~/.humbugrc
 """
diff --git a/examples/subscribe b/examples/subscribe
index 6b4381c..e864cfa 100755
--- a/examples/subscribe
+++ b/examples/subscribe
@@ -29,8 +29,8 @@ usage = """subscribe --user=<bot's email address> --api-key=<bot's api key> [opt
 
 Ensures the user is subscribed to the listed streams.
 
-Examples: subscribe --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams=foo
-          subscribe --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams='foo bar'
+Examples: subscribe --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams=foo
+          subscribe --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams='foo bar'
 
 You can omit --user and --api-key arguments if you have a properly set up ~/.humbugrc
 """
diff --git a/examples/unsubscribe b/examples/unsubscribe
index 455073f..2dc5f17 100755
--- a/examples/unsubscribe
+++ b/examples/unsubscribe
@@ -29,8 +29,8 @@ usage = """unsubscribe  --user=<bot's email address> --api-key=<bot's api key> [
 
 Ensures the user is not subscribed to the listed streams.
 
-Examples: unsubscribe --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams=foo
-          unsubscribe --user=tabbott@humbughq.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams='foo bar'
+Examples: unsubscribe --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams=foo
+          unsubscribe --user=tabbott@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --streams='foo bar'
 
 You can omit --user and --api-key arguments if you have a properly set up ~/.humbugrc
 """