diff --git a/google/auth/credentials.py b/google/auth/credentials.py
index bc42546..02082ca 100644
--- a/google/auth/credentials.py
+++ b/google/auth/credentials.py
@@ -63,7 +63,7 @@
         if not self.expiry:
             return False
 
-        # Remove 5 minutes from expiry to err on the side of reporting
+        # Remove 10 seconds from expiry to err on the side of reporting
         # expiration early so that we avoid the 401-refresh-retry loop.
         skewed_expiry = self.expiry - _helpers.CLOCK_SKEW
         return _helpers.utcnow() >= skewed_expiry