diff --git a/solvable/src/pipe_io_main.py b/solvable/src/pipe_io_main.py
index 31e3271..bef89a9 100644
--- a/solvable/src/pipe_io_main.py
+++ b/solvable/src/pipe_io_main.py
@@ -15,7 +15,14 @@ from pipe_io_auxlib import (
 if __name__ == '__main__':
     '''
     Creates general purpose pipes.
-    You can send/receive JSON messages to/from the TFW server as any user.
+    The first parameter associates the receiving pipe with a key, which is
+    an empty string in this case. It has a special meaning, you can
+    subscribe to every kind of message with this key.
+    If you wish to filter incoming data, specify a single or more keys in
+    a list, eg.: processmanager, ide, key...
+    You can send/receive JSON messages to/from the TFW server as any user,
+    because we gave read+write permissions, without that parameter, only
+    the owner has access to the pipes.
     '''
     json_pipe = PipeIOEventHandler(
         '',