diff --git a/articles/bsd.md b/articles/bsd.md
index ccef01d..a0fc03b 100644
--- a/articles/bsd.md
+++ b/articles/bsd.md
@@ -30,3 +30,4 @@ it couldn't be released until 1992, a year later after Linux initial release. Fr
 - [Linux](linux.md)
 - [Unix](unix.md)
 - [Hurd](hurd.md)
+- BSD documental: <https://inv.nadeko.net/watch?v=2oLuJSFZKEs>