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-rw-r--r--Doc/library/mmap.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index 12b14d6933..1f3fbc340f 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -244,7 +244,8 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
.. method:: readline()
Returns a single line, starting at the current file position and up to the
- next newline.
+ next newline. The file position is updated to point after the bytes that were
+ returned.
.. method:: resize(newsize)