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diff --git a/docs/testing/developer/devguide/design/vswitchperf_design.rst b/docs/testing/developer/devguide/design/vswitchperf_design.rst
index 33051493..96ffcf62 100644
--- a/docs/testing/developer/devguide/design/vswitchperf_design.rst
+++ b/docs/testing/developer/devguide/design/vswitchperf_design.rst
@@ -415,6 +415,30 @@ Detailed description of ``TRAFFIC`` dictionary items follows:
congestion (DEI header field).
Data type: int (NOTE: must fit to 1 bit)
Default value: 0
+ 'capture' - A dictionary with traffic capture configuration.
+ NOTE: It is supported only by T-Rex traffic generator.
+ 'enabled' - Specifies if traffic should be captured
+ Data type: bool
+ Default value: False
+ 'tx_ports' - A list of ports, where frames transmitted towards DUT will
+ be captured. Ports have numbers 0 and 1. TX packet capture
+ is disabled if list of ports is empty.
+ Data type: list
+ Default value: [0]
+ 'rx_ports' - A list of ports, where frames received from DUT will
+ be captured. Ports have numbers 0 and 1. RX packet capture
+ is disabled if list of ports is empty.
+ Data type: list
+ Default value: [1]
+ 'count' - A number of frames to be captured. The same count value
+ is applied to both TX and RX captures.
+ Data type: int
+ Default value: 1
+ 'filter' - An expression used to filter TX and RX packets. It uses the same
+ syntax as pcap library. See pcap-filter man page for additional
+ details.
+ Data type: str
+ Default value: ''
.. _configuration-of-guest-options: