Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3191#discussion_r98025995
--- Diff: docs/dev/windows.md ---
@@ -257,11 +273,11 @@ For example, in China you would have to specify an
offset of `Time.hours(-8)`.
### Session Windows
The *session windows* assigner groups elements by sessions of activity.
Session windows do not overlap and
-do not have a fixed start and end time in contrast to *tumbling windows*
and *sliding windows*. Instead a
-session window assigner closes a window when it does not receive elements
for a certain period
-of time, i.e., when a gap of inactivity occurred. A session window
assigner is configured with the *session gap* which
-defines how long the assigner waits until it closes the current session
window and assigns following elements
-to a new session window.
+do not have a fixed start and end time, in contrast to *tumbling windows*
and *sliding windows*. Instead a
+session window closes when it does not receive elements for a certain
period of time, *i.e.*, when a gap of
+inactivity occurred. A session window assigner is configured with the
*session gap* which
+defines how long is the required period of inactivity. After this period
expires, the current session closes
--- End diff --
"After this period expires" -> "When this period expires"?
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