diff --git a/tunnels.cfg.md b/tunnels.cfg.md
index 3fa67fc..d7f8d80 100644
--- a/tunnels.cfg.md
+++ b/tunnels.cfg.md
@@ -11,4 +11,6 @@ Example of client tunnel:
  `port=6668`  
  `destination=irc.echelon.i2p`  
  `keys=irc.dat `  
- 
\ No newline at end of file
+ 
+If keys is empty, transient keys will be created on every restart.  
+If keys file is not found, new keys will be created and store into specified file.
\ No newline at end of file