diff --git a/sys-kernel/ck-sources/metadata.xml b/sys-kernel/ck-sources/metadata.xml
index 097975e..f367528 100644
--- a/sys-kernel/ck-sources/metadata.xml
+++ b/sys-kernel/ck-sources/metadata.xml
@@ -1,4 +1,11 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version='1.0' encoding='UTF-8'?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
+  <use>
+    <flag name="experimental">Apply experimental patches; for more information, see "https://wiki.gentoo.org/wiki/Project:Kernel/Experimental".</flag>
+  </use>
+  <upstream>
+    <remote-id type="cpe">cpe:/o:linux:linux_kernel</remote-id>
+    <remote-id type="github">ckolivas/linux</remote-id>
+  </upstream>
 </pkgmetadata>