diff --git a/build/sdk.atree b/build/sdk.atree
index 88e72a9..6696deb 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -19,9 +19,9 @@
 #
 
 # version files for the SDK updater, from sdk.git
-sdk/files/doc_source.properties docs/source.properties
+development/sdk/doc_source.properties docs/source.properties
+development/sdk/platform_source.properties platforms/${PLATFORM_NAME}/source.properties
 sdk/files/tools_source.properties tools/source.properties
-sdk/files/platform_source.properties platforms/${PLATFORM_NAME}/source.properties
 
 # host tools from out/host/$(HOST_OS)-$(HOST_ARCH)/
 bin/aapt platforms/${PLATFORM_NAME}/tools/aapt
diff --git a/sdk/doc_source.properties b/sdk/doc_source.properties
new file mode 100644
index 0000000..73c0d76
--- /dev/null
+++ b/sdk/doc_source.properties
@@ -0,0 +1,5 @@
+Pkg.UserSrc=false
+Platform.Version=2.1
+Pkg.Revision=1
+AndroidVersion.ApiLevel=7
+
diff --git a/sdk/platform_source.properties b/sdk/platform_source.properties
new file mode 100644
index 0000000..d4ff795
--- /dev/null
+++ b/sdk/platform_source.properties
@@ -0,0 +1,5 @@
+Pkg.Desc=Android SDK Platform 2.1_r1
+Pkg.UserSrc=false
+Platform.Version=2.1
+Pkg.Revision=1
+AndroidVersion.ApiLevel=7
diff --git a/sdk/usbdriver_source.properties b/sdk/usbdriver_source.properties
new file mode 100755
index 0000000..d7666eb
--- /dev/null
+++ b/sdk/usbdriver_source.properties
@@ -0,0 +1,4 @@
+Pkg.Revision=3
+Archive.Os=WINDOWS
+Archive.Arch=ANY
+Extra.Path=usb_driver