diff --git a/docs/user-guide/tunnels.md b/docs/user-guide/tunnels.md
index 3876d8c..22770d4 100644
--- a/docs/user-guide/tunnels.md
+++ b/docs/user-guide/tunnels.md
@@ -99,6 +99,7 @@ Optional parameters:
 * signaturetype   -- signature type for new keys. 0 (DSA), 1 (ECDSA-P256), 7 (EDDSA), 11 (RedDSA). RSA signatures (4,5,6) are not allowed and will be changed to 7. 7 by default
 * cryptotype       -- crypto type for new keys. Experimental. Should be always 0
 * destinationport -- connect to particular port at destination. 0 by default
+* keepaliveinterval -- send ping to the destination after this interval in seconds. 0 by default meaning no pings
 
 So, given the example above, if you connected to 127.0.0.1:6668 on localhost, i2pd would tunnel that to irc.echelon.i2p:6668