diff --git a/docs/Libre-Kernel.md b/docs/Libre-Kernel.md
index e003d5a..62b9efd 100644
--- a/docs/Libre-Kernel.md
+++ b/docs/Libre-Kernel.md
@@ -62,6 +62,7 @@ In `/etc/portage/package.mask`:
 sys-kernel/gentoo-kernel
 sys-kernel/gentoo-kernel-bin
 sys-kernel/vanilla-kernel
+virtual/linux-sources::gentoo
 ```
 
 ## Detailed Instructions