Update option-source-log-iw-size.md (#171)

* Update option-source-log-iw-size.md

* Review fixes

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Co-authored-by: Robert Fekete <[email protected]>

Author: orymate

content/headless/chunk/option-source-log-iw-size.md

@@ -9,5 +9,8 @@
 | Type:    | number |
 | Default: | 100    |
 
-*Description:* The size of the initial window, this value is used during flow-control. Its value cannot be lower than 100, unless the `dynamic-window-size()` option is enabled. For details on flow-control, see {{% xref "/chapter-routing-filters/concepts-flow-control/_index.md" %}}.
+*Description:* Specifies the source window size - the maximum number of in-flight messages permitted by the source before flow control is enforced. This only applies when `flow-control` is enabled.
 
+If a `max-connections()` setting is in effect (for example in case of TCP sources), the `log-iw-size()` value means the total window size, and it's divided proportionally between the connections. Its value cannot be lower than 100, unless the `dynamic-window-size()` option is enabled, which increases the effective windows size dynamically.
+
+Note that when using `disk-buffer()`, the messages stored on disk are not included in the window size calculation. For details about the effects of this parameter, see {{% xref "/chapter-routing-filters/concepts-flow-control/_index.md" %}}.