diff --git a/ext/native-decls/MumbleDoesChannelExist.md b/ext/native-decls/MumbleDoesChannelExist.md
index 6ee15a941d..9e14a23ded 100644
--- a/ext/native-decls/MumbleDoesChannelExist.md
+++ b/ext/native-decls/MumbleDoesChannelExist.md
@@ -5,10 +5,13 @@ apiset: client
 ## MUMBLE_DOES_CHANNEL_EXIST
 
 ```c
-void MUMBLE_DOES_CHANNEL_EXIST(int channel);
+BOOL MUMBLE_DOES_CHANNEL_EXIST(int channel);
 ```
 
 Check whether specified channel exists on the Mumble server.
 
 ## Parameters
 * **channel**: A game voice channel ID.
+
+## Return value
+True if the specific channel exists. False otherwise.