doc: Fixup Handsfree API

diff --git a/doc/handsfree-api.txt b/doc/handsfree-api.txt
index 5f45efb..df3d9bb 100644 (file)
--- a/doc/handsfree-api.txt
+++ b/doc/handsfree-api.txt
@@ -19,6 +19,8 @@ Methods               dict GetProperties()
 
                        Possible Errors: [service].Error.InProgress
                                         [service].Error.InvalidArguments
+                                        [service].Error.NotImplemented
+                                        [service].Error.NotSupported
 
                string RequestPhoneNumber()
 
@@ -63,7 +65,7 @@ Properties    array{string} Features [readonly]
                        to activate or deactivate the function from the HF, or
                        the AG could autonomously initiate it.
 
-               boolean EchoCancelingNoiseReduction [readwrite]
+               boolean EchoCancelingNoiseReduction [readwrite, optional]
 
                        Non-persistent Boolean property representing whether
                        echo canceling and noise reduction is enabled in the