diff --git a/examples/platforms/efr32/README.md b/examples/platforms/efr32/README.md
index f4f9bf441..f563c19b4 100644
--- a/examples/platforms/efr32/README.md
+++ b/examples/platforms/efr32/README.md
@@ -37,8 +37,8 @@ $ ./script/bootstrap
 
 2. Install Flex (Gecko) SDK including RAIL Library from Simplicity Studio.
    - Connect EFR32MG12P Wireless Starter Kit to Simplicity Studio.
-   - Find the latest Flex SDK in the Software Update page and click Install.
-   - Flex SDK will be installed in the path: `/SimplicityStudio_v4/developer/sdks/gecko_sdk_suite`.
+   - Find Flex SDK v2.3 in the Software Update page and click Install.
+   - Flex SDK v2.3 will be installed in the path: `/SimplicityStudio_v4/developer/sdks/gecko_sdk_suite`.
 
 For more information on configuring, building, and installing applications for the Wireless Gecko (EFR32)
 portfolio using RAIL, see [Getting Started with RAIL Library quick start guide][QSG121]. For more information
diff --git a/include/openthread/udp.h b/include/openthread/udp.h
index 6f0506c12..ada854c87 100644
--- a/include/openthread/udp.h
+++ b/include/openthread/udp.h
@@ -104,7 +104,7 @@ typedef struct otUdpSocket
  *
  * @returns A pointer to the message buffer or NULL if no message buffers are available or parameters are invalid.
  *
- * @sa otFreeMessage
+ * @sa otMessageFree
  *
  */
 otMessage *otUdpNewMessage(otInstance *aInstance, const otMessageSettings *aSettings);