diff --git a/README.md b/README.md
index 6d7ed6a..af16d27 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # nix-public-expressions
 
-EXPERIMENTAL - Stockage des expressions publiques
\ No newline at end of file
+EXPERIMENTAL - Stockage des expressions publiques
+
+
+* https://www.mpscholten.de/nixos/2016/07/07/private-github-repositories-and-nixos.html
+* https://nixos.org/wiki/FAQ#How_do_I_know_the_sha256_to_use_with_fetchgit.3F