diff --git a/doc/en/weechat_relay_protocol.en.adoc b/doc/en/weechat_relay_protocol.en.adoc
index 1858112e9..96d300b0b 100644
--- a/doc/en/weechat_relay_protocol.en.adoc
+++ b/doc/en/weechat_relay_protocol.en.adoc
@@ -168,6 +168,9 @@ WeeChat replies with a hashtable containing the following keys and values:
   compute the hash of password on this nonce, concatenated with a client nonce
   and the user password (the _relay_ nonce + the client nonce is the salt used
   in the password hash algorithm)
+* _compression_: compression type:
+** _zlib_: messages are compressed with _zlib_
+** _off_: messages are not compressed
 
 [TIP]
 With WeeChat ≤ 2.8, the command _handshake_ is not implemented, WeeChat silently
diff --git a/doc/fr/weechat_relay_protocol.fr.adoc b/doc/fr/weechat_relay_protocol.fr.adoc
index 34887a86f..709c4d432 100644
--- a/doc/fr/weechat_relay_protocol.fr.adoc
+++ b/doc/fr/weechat_relay_protocol.fr.adoc
@@ -177,6 +177,9 @@ suivantes :
   concaténé avec un nonce client et le mot de passe utilisateur (le nonce
   _relay_ + le nonce client constituent le sel utilisé dans l'algorithme de
   hachage du mot de passe)
+* _compression_ : type de compression :
+** _zlib_ : les messages sont compressés avec _zlib_
+** _off_ : les messages ne sont pas compressés
 
 [TIP]
 Avec WeeChat ≤ 2.8, la commande _handshake_ n'est pas implémentée, WeeChat ignore
diff --git a/doc/ja/weechat_relay_protocol.ja.adoc b/doc/ja/weechat_relay_protocol.ja.adoc
index 8e2d51f1b..cbb3549c0 100644
--- a/doc/ja/weechat_relay_protocol.ja.adoc
+++ b/doc/ja/weechat_relay_protocol.ja.adoc
@@ -177,6 +177,9 @@ WeeChat replies with a hashtable containing the following keys and values:
   compute the hash of password on this nonce, concatenated with a client nonce
   and the user password (the _relay_ nonce + the client nonce is the salt used
   in the password hash algorithm)
+* _compression_: compression type:
+** _zlib_: messages are compressed with _zlib_
+** _off_: messages are not compressed
 
 [TIP]
 With WeeChat ≤ 2.8, the command _handshake_ is not implemented, WeeChat silently
diff --git a/src/plugins/relay/weechat/relay-weechat-protocol.c b/src/plugins/relay/weechat/relay-weechat-protocol.c
index 55325df23..e833d5277 100644
--- a/src/plugins/relay/weechat/relay-weechat-protocol.c
+++ b/src/plugins/relay/weechat/relay-weechat-protocol.c
@@ -199,6 +199,10 @@ relay_weechat_protocol_handshake_reply (struct t_relay_client *client,
             hashtable,
             "totp",
             (totp_secret && totp_secret[0]) ? "on" : "off");
+        weechat_hashtable_set (
+            hashtable,
+            "compression",
+            relay_weechat_compression_string[RELAY_WEECHAT_DATA(client, compression)]);
 
         msg = relay_weechat_msg_new (id);
         if (msg)
diff --git a/src/plugins/relay/weechat/relay-weechat.h b/src/plugins/relay/weechat/relay-weechat.h
index c63bdca79..2bb875d1b 100644
--- a/src/plugins/relay/weechat/relay-weechat.h
+++ b/src/plugins/relay/weechat/relay-weechat.h
@@ -60,6 +60,8 @@ struct t_relay_weechat_data
     struct t_hook *hook_timer_nicklist;   /* timer for sending nicklist     */
 };
 
+extern char *relay_weechat_compression_string[];
+
 extern int relay_weechat_compression_search (const char *compression);
 extern void relay_weechat_hook_signals (struct t_relay_client *client);
 extern void relay_weechat_unhook_signals (struct t_relay_client *client);