document /etc/gentoo-release test

diff --git a/pct.adoc b/pct.adoc
index 014e48d..9f4fde8 100644 (file)
--- a/pct.adoc
+++ b/pct.adoc
@@ -243,6 +243,8 @@ ArchLinux:: test /etc/arch-release
 
 Alpine:: test /etc/alpine-release
 
+Gentoo:: test /etc/gentoo-release
+
 NOTE: Container start fails if the configured 'ostype' differs from the auto
 detected type.