Fix: Documentation for Delta Feature

Issue-ID: CPS-2074
Signed-off-by: Arpit Singh <as00745003@techmahindra.com>
Change-Id: Ib32b4c75f7eb5402367f69a077c447a3eb062b0b
diff --git a/docs/design.rst b/docs/design.rst
index 80eb5f1..af1f5ab 100644
--- a/docs/design.rst
+++ b/docs/design.rst
@@ -72,6 +72,12 @@
 Several CPS APIs use the cps-path (or cpsPath in Java API) parameter.
 The CPS Path is described in detail in :doc:`cps-path`.
 
+CPS Delta
+=========
+
+CPS Delta feature provides the ability to find the delta/difference between two JSON configurations.
+The CPS Delta feature is described in detail in :doc:`cps-delta-feature`.
+
 NCMP CM Handle Querying
 =======================