diff --git a/cachecontrol/controller.py b/cachecontrol/controller.py
index 4e251c8..c7dd8a1 100644
--- a/cachecontrol/controller.py
+++ b/cachecontrol/controller.py
@@ -490,7 +490,7 @@ def update_cached_response(
         #
         # The server isn't supposed to send headers that would make
         # the cached body invalid. But... just in case, we'll be sure
-        # to strip out ones we know that might be problmatic due to
+        # to strip out ones we know that might be problematic due to
         # typical assumptions.
         excluded_headers = ["content-length"]