diff --git a/google/auth/_helpers.py b/google/auth/_helpers.py
index 09f32f8..11c6b1a 100644
--- a/google/auth/_helpers.py
+++ b/google/auth/_helpers.py
@@ -20,7 +20,7 @@
 import urllib
 
 
-CLOCK_SKEW_SECS = 10  # 10 seconds
+CLOCK_SKEW_SECS = 60  # 60 seconds
 CLOCK_SKEW = datetime.timedelta(seconds=CLOCK_SKEW_SECS)
 
 
diff --git a/google/auth/jwt.py b/google/auth/jwt.py
index d931bf7..1bc7e5e 100644
--- a/google/auth/jwt.py
+++ b/google/auth/jwt.py
@@ -190,7 +190,11 @@
     # for clock skew.
     earliest = iat - _helpers.CLOCK_SKEW_SECS
     if now < earliest:
-        raise ValueError("Token used too early, {} < {}".format(now, iat))
+        raise ValueError(
+            "Token used too early, {} < {}. Check that your computer's clock is set correctly.".format(
+                now, iat
+            )
+        )
 
     # Make sure the token wasn't issued in the past.
     exp = payload["exp"]