doc: describe the AuthenticationMethod property

diff --git a/doc/connman-api.txt b/doc/connman-api.txt
index 2227ab8..8f72087 100644 (file)
--- a/doc/connman-api.txt
+++ b/doc/connman-api.txt
@@ -180,6 +180,10 @@ Properties boolean Active [readwrite]
                                "wap" - Used by WAP related services
                                "ims" - Used by IMS related services
 
+               string AuthenticationMethod [readwrite]
+                       Holds the PPP authentication method to use.  Valid
+                       values are "pap" and "chap".  Defaults to "chap".
+
                string Username [readwrite]
 
                        Holds the username to be used for authentication