This commit adds a deprecation note of capitalized property names of
RISC-V CPU to documentation.

Signed-off-by: Tsukasa OI <research_trasio@irq.a4lg.com>
---
 docs/about/deprecated.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index a92ae0f162..cfc9adcd4b 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -300,6 +300,16 @@ Options are:
 Device options
 --------------
 
+CPU options
+'''''''''''
+
+Capitalized property names on RISC-V ``-cpu`` (since 7.1)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Using capitalized RISC-V CPU property names like ``-cpu rv64,Counters=on`` is
+deprecated.  Use lowercase names instead (e.g. ``-cpu rv64,counters=on``).
+
+
 Emulated device options
 '''''''''''''''''''''''
 
-- 
2.34.1