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diff --git a/docs/designspec/dashboard.rst b/docs/designspec/dashboard.rst
index ad5520b6..20a407a7 100644
--- a/docs/designspec/dashboard.rst
+++ b/docs/designspec/dashboard.rst
@@ -68,3 +68,47 @@ Comparison
Comparison can be done between different PODs or different configuration on the
same PODs.
+
+In a comparison view, the metrics are displayed in the same diagram. And the
+parameters are listed side by side.
+
+Both common parameters and different parameters are listed. Common values are
+merged to the same cell. And user may configure the view to hide common rows.
+
+A draft design is as following::
+
+ ^
+ |
+ |
+ |
+ | XXXXXXXX
+ | XXX XX+-+ XXXXXXXXXX
+ | XXX +XXXX XXXXX
+ +-+XX X +--+ ++ XXXXXX +-+
+ | X+-+X +----+ +-+ +----+X
+ |X +--+ +---+ XXXXXX X
+ | +-------+ X
+ |
+ |
+ +----------------------------------------------------->
+
+ +--------------------+----------------+---------------+
+ | different param 1 | | |
+ | | | |
+ +-----------------------------------------------------+
+ | different param 2 | | |
+ | | | |
+ +-------------------------------------+---------------+
+ | common param 1 | |
+ | | |
+ +-------------------------------------+---------------+
+ | different param 3 | | |
+ | | | |
+ +-------------------------------------+---------------+
+ | common param 2 | |
+ | | |
+ +--------------------+--------------------------------+
+ +------------+
+ | HIDE COMMON|
+ +------------+
+