diff --git a/README.md b/README.md
index 98db1b581a74fb2fcc9e16b8a5cab101fd0acadb..b91189aef0f40c08b24465bb45261c9eb8ec4484 100755
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ it provides access to clocking, power, sensor, and pin control via a client RPC
 To facilitate isolation between cores, the SM partitions the SoC into logical machines (LM) which have
 statically configurable access rights to both hardware and RPC API calls.
 
+Supported development environments include Ubuntu 2020.04, 2022.04, and 2024.04.
+
 Download from GitHub
 ====================
 
@@ -38,6 +40,8 @@ To build the release notes:
 
 The output is sm/doc/sm-rn.pdf (also an html version in sm/doc/build/html).
 
+Supported versions of doxygen include 1.8.17, 1.9.1, and 1.9.8.
+
 Installing the Toolchain
 ========================
 
diff --git a/sm/doc/rn_add.md b/sm/doc/rn_add.md
index a40d4df53b27f72d16334b62966abd7d98f093b2..f4ff39e759e16b7cbc5c5b71f3e6eba0a180d2ee 100755
--- a/sm/doc/rn_add.md
+++ b/sm/doc/rn_add.md
@@ -18,6 +18,9 @@ The tool chain used with this SM is Arm GNU Toolchain Version **12.3.Rel1** obta
 [Arm GNU Toolchain](https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain).
 Use the x86_64 Linux hosted AArch32 bare-metal target (arm-none-eabi) toolchain.
 
+Supported development environments include Ubuntu 2020.04, 2022.04, and 2024.04. Supported
+versions of doxygen include 1.8.17, 1.9.1, and 1.9.8.
+
 SCMI API Changes {#RN_ADD_API}
 ================