diff --git a/1. Acronymes.md b/1. Acronymes.md
index 8558af9..bcbea83 100644
--- a/1. Acronymes.md	
+++ b/1. Acronymes.md	
@@ -244,17 +244,20 @@ Les acronymes télécoms sont issus de l'excellent travail regroupé ici : [GLOT
 * GSM : Global System for Mobile Communications.
 
 ## H
-* HD : Haut débit
+* HD : Haut Débit.
 * HDLC : Hight level Data Link Control.
-* HIDS : Host Intrusion Detection System.
+* HIDS : Host-based Intrusion Detection System.
 * HIPS : Host-based Intrusion Prevention System.
 * HLR : Home Location Register.
-* HSDPA : High Speed Download Packet Access
+* HMAC : Hash-based Message Authentication Code.
+* HOTP : HMAC-based One time Password.
+* HSDPA : High Speed Download Packet Access.
+* HSM : Hardware Security Module.
 * HSN : Hopping Sequence Number.
 * HSUPA : High Speed Uplink Packet Access.
 * HTML : HyperText Markup Language.
-* HTTP : Hypertext transfer protocol.
-* HTTPS : Hypertext transfer protocol secured.
+* HTTP : HyperText Transfer Protocol.
+* HTTPS : HyperText Transfer Protocol Secured.
 
 ## I
 * IAB : Internet Activities Board.