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diff --git a/doc/guides/cryptodevs/overview.rst b/doc/guides/cryptodevs/overview.rst
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+++ b/doc/guides/cryptodevs/overview.rst
@@ -11,6 +11,33 @@ Supported Feature Flags
.. include:: overview_feature_table.txt
+.. Note::
+
+ - "In Place SGL" feature flag stands for "In place Scatter-gather list",
+ which means that an input buffer can consist of multiple segments,
+ being the operation in-place (input address = output address).
+
+ - "OOP SGL In SGL Out" feature flag stands for
+ "Out-of-place Scatter-gather list Input, Scatter-gater list Output",
+ which means pmd supports different scatter-gather styled input and output buffers
+ (i.e. both can consists of multiple segments).
+
+ - "OOP SGL In LB Out" feature flag stands for
+ "Out-of-place Scatter-gather list Input, Linear Buffers Output",
+ which means PMD supports input from scatter-gathered styled buffers,
+ outputting linear buffers (i.e. single segment).
+
+ - "OOP LB In SGL Out" feature flag stands for
+ "Out-of-place Linear Buffers Input, Scatter-gather list Output",
+ which means PMD supports input from linear buffer, outputting
+ scatter-gathered styled buffers.
+
+ - "OOP LB In LB Out" feature flag stands for
+ "Out-of-place Linear Buffers Input, Scatter-gather list Output",
+ which means that Out-of-place operation is supported,
+ with linear input and output buffers.
+
+
Supported Cipher Algorithms
---------------------------