diff --git a/doc/gatt-api.txt b/doc/gatt-api.txt
index 6c98b87..3f4a3ca 100644
--- a/doc/gatt-api.txt
+++ b/doc/gatt-api.txt
@@ -91,6 +91,56 @@ Methods		array{byte} ReadValue(dict options)
 					 org.bluez.Error.NotAuthorized
 					 org.bluez.Error.NotSupported
 
+		fd, uint16 AcquireWrite() [experimental] (Client only)
+
+			Acquire write file descriptor and MTU and lock
+			write access to the characteristic.
+
+			Only works with characteristic that has
+			WriteAcquired property which relies on
+			write-without-response Flag.
+
+			To release the lock the client shall close the file
+			descriptor, a HUP is generated in case the device
+			is disconnected.
+
+			Note: the MTU can only be negotiated once and is
+			symmetric therefore this method may be delayed in
+			order to have the exchange MTU completed, because of
+			that the file descriptor is closed during
+			reconnections as the MTU has to be renegotiated.
+
+			Possible Errors: org.bluez.Error.Failed
+					 org.bluez.Error.NotSupported
+
+		fd, uint16 AcquireNotify() [experimental] (Client only)
+
+			Acquire notify file descriptor and MTU and lock
+			notifications to the characteristic.
+
+			Only works with characteristic that has NotifyAcquired
+			which relies on notify Flag and no other client have
+			called StartNotify.
+
+			Notification are enabled during this procedure so
+			StartNotify shall not be called, any notification
+			will be dispatched via file descriptor therefore the
+			Value property is no affected during the time where
+			notify has been acquired.
+
+			To release the lock the client shall close the file
+			descriptor, a HUP is generated in case the device
+			is disconnected.
+
+			Note: the MTU can only be negotiated once and is
+			symmetric therefore this method may be delayed in
+			order to have the exchange MTU completed, because of
+			that the file descriptor is closed during
+			reconnections as the MTU has to be renegotiated.
+
+			Possible Errors: org.bluez.Error.Failed
+					 org.bluez.Error.NotSupported
+
 		void StartNotify()
 
 			Starts a notification session from this characteristic
@@ -125,6 +175,18 @@ Properties	string UUID [read-only]
 			when a notification or indication is received, upon
 			which a PropertiesChanged signal will be emitted.
 
+		boolean WriteAcquired [read-only, optional]
+
+			True, if this characteristic has been acquire by any
+			client using AcquireWrite. This properties is ommited
+			in case write-without-response flag is not set.
+
+		boolean NotifyAcquired [read-only, optional]
+
+			True, if this characteristic has been acquire by any
+			client using AcquireNotify. This properties is ommited
+			in case notify flag is not set.
+
 		boolean Notifying [read-only, optional]
 
 			True, if notifications or indications on this