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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 bc54476c..50682a93 100644
--- a/docs/testing/developer/devguide/design/vswitchperf_design.rst
+++ b/docs/testing/developer/devguide/design/vswitchperf_design.rst
@@ -477,6 +477,20 @@ Detailed description of ``TRAFFIC`` dictionary items follows:
'enabled' - Specifies if the histogram provisioning is enabled or not.
'type' - Defines how histogram is provided. Currenty only 'Default' is defined.
'Default' - Default histogram as provided by the Traffic-generator.
+ 'imix' - A dictionary for IMIX Specification.
+ 'enabled' - Specifies if IMIX is enabled or NOT.
+ 'type' - The specification type - denotes how IMIX is specified.
+ Currently only 'genome' type is defined.
+ Other types (ex: table-of-proportions) can be added in future.
+ 'genome' - The Genome Encoding of Pkt-Sizes and Ratio for IMIX.
+ The Ratio is inferred from the number of particular geneome characters
+ Genome encoding is described in RFC 6985. This specification is closest
+ to the method described in section 6.2 of RFC 6985.
+ Ex: 'aaaaaaaddddg' denotes ratio of 7:4:1 of packets sizes 64:512:1518.
+ Note: Exact-sequence is not maintained, only the ratio of packets
+ is ensured.
+ Data type: str
+ Default Value: 'aaaaaaaddddg'
.. _configuration-of-guest-options: