diff --git a/examples/all-clusters-app/linux/include/CHIPProjectAppConfig.h b/examples/all-clusters-app/linux/include/CHIPProjectAppConfig.h
index 2b41535e8105ef..0285563216e706 100644
--- a/examples/all-clusters-app/linux/include/CHIPProjectAppConfig.h
+++ b/examples/all-clusters-app/linux/include/CHIPProjectAppConfig.h
@@ -49,5 +49,5 @@
 #define CHIP_CONFIG_ENABLE_BDX_LOG_TRANSFER 1
 
 // Claim a device type while advertising that matches the device type on our
-// endpoint 1.
+// endpoint 1.  0x0101 is the "Dimmable Light" device type.
 #define CHIP_DEVICE_CONFIG_DEVICE_TYPE 0x0101
diff --git a/examples/all-clusters-app/tizen/include/CHIPProjectAppConfig.h b/examples/all-clusters-app/tizen/include/CHIPProjectAppConfig.h
index 04f82317109f00..3d67773217a22a 100644
--- a/examples/all-clusters-app/tizen/include/CHIPProjectAppConfig.h
+++ b/examples/all-clusters-app/tizen/include/CHIPProjectAppConfig.h
@@ -35,5 +35,5 @@
 #define CHIP_CONFIG_MAX_GROUP_ENDPOINTS_PER_FABRIC 3
 
 // Claim a device type while advertising that matches the device type on our
-// endpoint 1.
+// endpoint 1.  0x0101 is the "Dimmable Light" device type.
 #define CHIP_DEVICE_CONFIG_DEVICE_TYPE 0x0101