diff --git a/cassandra/cluster.py b/cassandra/cluster.py
index <HASH>..<HASH> 100644
--- a/cassandra/cluster.py
+++ b/cassandra/cluster.py
@@ -1940,7 +1940,7 @@ class Session(object):
     increasing timestamps across clusters, or set it to to ``lambda:
     int(time.time() * 1e6)`` if losing records over clock inconsistencies is
     acceptable for the application. Custom :attr:`timestamp_generator` s should
-    be callable, and calling them should return an integer representing seconds
+    be callable, and calling them should return an integer representing microseconds
     since some point in time, typically UNIX epoch.
 
     .. versionadded:: 3.8.0
diff --git a/cassandra/timestamps.py b/cassandra/timestamps.py
index <HASH>..<HASH> 100644
--- a/cassandra/timestamps.py
+++ b/cassandra/timestamps.py
@@ -70,7 +70,7 @@ class MonotonicTimestampGenerator(object):
         call an instantiated ``MonotonicTimestampGenerator`` object.
 
         :param int now: an integer to be used as the current time, typically
-            representing the current time in seconds since the UNIX epoch
+            representing the current time in microseconds since the UNIX epoch
         :param int last: an integer representing the last timestamp returned by
             this object
         """
timestamp gen docstrings: sec-->usec