diff --git a/doc/notes.org b/doc/notes.org
index 97bcf87..9049b87 100644
--- a/doc/notes.org
+++ b/doc/notes.org
@@ -31,3 +31,7 @@ E en kcal/mol
 Bonne LH si E <= -3 kcal/mol
 
 Cutoff choisi permet une distance N-O jusqu'à 2.2 Angström
+N-H bound distance : 1.030 A
+https://pubs.acs.org/doi/pdf/10.1021/ja00313a047
+
+Angles : https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/peptide-bond