diff --git a/0002-binary-protocol.md b/0002-binary-protocol.md
index 70dd4b8372c4b3588b5e87a46dcc18c39a19c527..509dc230b913043a33b15ef1bb9f48effdeeefce 100644
--- a/0002-binary-protocol.md
+++ b/0002-binary-protocol.md
@@ -68,7 +68,7 @@ Alphabet : `123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz`
 - **Base64** : Data format used for non error-prone data such as signatures.  
 Alphabet : `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/`
 - **Name64** : Variation of **Base64** format for names formating. Allow to store names in a more concise way that raw ASCII/UTF-8 text. 
-Alphabet : `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-`
+Alphabet : `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-`
 
 ## 2.3. Hashes