diff --git a/src/idl/nanopb/payload.proto b/src/idl/nanopb/payload.proto
index 7f2a6dda..c5443627 100644
--- a/src/idl/nanopb/payload.proto
+++ b/src/idl/nanopb/payload.proto
@@ -20,7 +20,7 @@ payload, as well as events and measurements generated on the mobile device
 itself, and bundle them into its own Payload message to send to the
 Pipeline API
 
-More complex patterns occur when the watch sends mupltiple Payloads, at
+More complex patterns occur when the watch sends multiple Payloads, at
 different times, to the mobile before it gets a chance to send the data on to
 the web, or if multiple devices are connected simultaneously to one mobile
 device.
diff --git a/tools/tests/test_json2commands.py b/tools/tests/test_json2commands.py
index b5235e66..c67e43fc 100644
--- a/tools/tests/test_json2commands.py
+++ b/tools/tests/test_json2commands.py
@@ -481,7 +481,7 @@ class MyTestCase(unittest.TestCase):
         self.assertTrue(open_path_command.open)
 
     def test_parse_json_sequence(self):
-        # Test mix of fills and open paths with mulitple frames
+        # Test mix of fills and open paths with multiple frames
         current_path = os.path.dirname(os.path.realpath(__file__))
         filename = current_path + '/json2commands_test.json'
         
diff --git a/tools/tool_check.py b/tools/tool_check.py
index 0d0a3339..dc1a2efe 100644
--- a/tools/tool_check.py
+++ b/tools/tool_check.py
@@ -86,7 +86,7 @@ def text_to_req_list(req_list_text):
             req_list.append((line, None, None))
             continue
         if match.group('package').endswith(','):
-            # Muliple requirements
+            # Multiple requirements
             match2 = VERSION_PATTERN.match(match.group('package').strip(','))
             if not match2:
                 Logs.pprint('RED', 'Don\'t understand line \'%s\'' % raw_line)