Fix type spec for set_from_to/3

diff --git a/src/xmpp.erl b/src/xmpp.erl
index 5b7e3d1ccb5461727414501fc0774b0e7246bf98..6e814519095570cb8cd6a99e7622459336d20a0f 100644 (file)
--- a/src/xmpp.erl
+++ b/src/xmpp.erl
@@ -205,9 +205,9 @@ set_to(#iq{} = IQ, J) -> IQ#iq{to = J};
 set_to(#message{} = Msg, J) -> Msg#message{to = J};
 set_to(#presence{} = Pres, J) -> Pres#presence{to = J}.
 
--spec set_from_to(iq(), jid:jid(), jid:jid()) -> iq();
-                (message(), jid:jid(), jid:jid()) -> message();
-                (presence(), jid:jid(), jid:jid()) -> presence().
+-spec set_from_to(iq(), undefined | jid:jid(), undefined | jid:jid()) -> iq();
+                (message(), undefined | jid:jid(), undefined | jid:jid()) -> message();
+                (presence(), undefined | jid:jid(), undefined | jid:jid()) -> presence().
 set_from_to(#iq{} = IQ, F, T) -> IQ#iq{from = F, to = T};
 set_from_to(#message{} = Msg, F, T) -> Msg#message{from = F, to = T};
 set_from_to(#presence{} = Pres, F, T) -> Pres#presence{from = F, to = T}.