diff --git a/python/mcap/mcap/reader.py b/python/mcap/mcap/reader.py
index 96a47d833..453be0818 100644
--- a/python/mcap/mcap/reader.py
+++ b/python/mcap/mcap/reader.py
@@ -84,7 +84,7 @@ def _chunks_matching_topics(
     :param summary: the summary of this MCAP.
     :param topics: topics to match. If None, all chunk indices in the summary are returned.
     :param start_time: if not None, messages from before this unix timestamp are not included.
-    :param end_time: if not None, messages from after this unix timestamp are not included.
+    :param end_time: if not None, messages at or after this unix timestamp are not included.
     """
     out: List[ChunkIndex] = []
     for chunk_index in summary.chunk_indexes:
@@ -138,8 +138,8 @@ def iter_messages(
         :param topics: if not None, only messages from these topics will be returned.
         :param start_time: an integer nanosecond timestamp. if provided, messages logged before this
             timestamp are not included.
-        :param end_time: an integer nanosecond timestamp. if provided, messages logged after this
-            timestamp are not included.
+        :param end_time: an integer nanosecond timestamp. if provided, messages logged at or after
+            this timestamp are not included.
         :param log_time_order: if True, messages will be yielded in ascending log time order. If
             False, messages will be yielded in the order they appear in the MCAP file.
         :param reverse: if both ``log_time_order`` and ``reverse`` are True, messages will be
@@ -160,8 +160,8 @@ def iter_decoded_messages(
         :param topics: if not None, only messages from these topics will be returned.
         :param start_time: an integer nanosecond timestamp. if provided, messages logged before this
             timestamp are not included.
-        :param end_time: an integer nanosecond timestamp. if provided, messages logged after this
-            timestamp are not included.
+        :param end_time: an integer nanosecond timestamp. if provided, messages logged at or after
+            this timestamp are not included.
         :param log_time_order: if True, messages will be yielded in ascending log time order. If
             False, messages will be yielded in the order they appear in the MCAP file.
         :param reverse: if both ``log_time_order`` and ``reverse`` are True, messages will be
@@ -274,8 +274,8 @@ def iter_messages(
         :param topics: if not None, only messages from these topics will be returned.
         :param start_time: an integer nanosecond timestamp. if provided, messages logged before this
             timestamp are not included.
-        :param end_time: an integer nanosecond timestamp. if provided, messages logged after this
-            timestamp are not included.
+        :param end_time: an integer nanosecond timestamp. if provided, messages logged at or after
+            this timestamp are not included.
         :param log_time_order: if True, messages will be yielded in ascending log time order. If
             False, messages will be yielded in the order they appear in the MCAP file.
         :param reverse: if both ``log_time_order`` and ``reverse`` are True, messages will be
@@ -476,8 +476,8 @@ def iter_messages(
         :param topics: if not None, only messages from these topics will be returned.
         :param start_time: an integer nanosecond timestamp. if provided, messages logged before this
             timestamp are not included.
-        :param end_time: an integer nanosecond timestamp. if provided, messages logged after this
-            timestamp are not included.
+        :param end_time: an integer nanosecond timestamp. if provided, messages logged at or after
+            this timestamp are not included.
         :param log_time_order: if True, messages will be yielded in ascending log time order. If
             False, messages will be yielded in the order they appear in the MCAP file.
         :param reverse: if both ``log_time_order`` and ``reverse`` are True, messages will be