diff --git a/libnm/nm-device.c b/libnm/nm-device.c
index 96698967b9..8344f2a037 100644
--- a/libnm/nm-device.c
+++ b/libnm/nm-device.c
@@ -1066,6 +1066,10 @@ nm_device_get_managed (NMDevice *device)
  * Since: 1.2
  *
  * Deprecated: 1.22, use nm_device_set_managed_async() or GDBusConnection
+ *
+ * This function is deprecated because it calls a synchronous D-Bus method
+ * and modifies the content of the NMClient cache client side. Also, it does
+ * not emit a property changed signal.
  **/
 void
 nm_device_set_managed (NMDevice *device, gboolean managed)
@@ -1108,6 +1112,9 @@ nm_device_get_autoconnect (NMDevice *device)
  * Enables or disables automatic activation of the #NMDevice.
  *
  * Deprecated: 1.22, use nm_device_set_autoconnect_async() or GDBusConnection
+ *
+ * This function is deprecated because it calls a synchronous D-Bus method
+ * and modifies the content of the NMClient cache client side.
  **/
 void
 nm_device_set_autoconnect (NMDevice *device, gboolean autoconnect)
diff --git a/libnm/nm-device.h b/libnm/nm-device.h
index ede606d8e9..bc8aad63df 100644
--- a/libnm/nm-device.h
+++ b/libnm/nm-device.h
@@ -77,11 +77,13 @@ NMDeviceCapabilities nm_device_get_capabilities     (NMDevice *device);
 gboolean             nm_device_get_managed          (NMDevice *device);
 
 NM_AVAILABLE_IN_1_2
+NM_DEPRECATED_IN_1_22
 _NM_DEPRECATED_SYNC_METHOD
 void                 nm_device_set_managed          (NMDevice *device, gboolean managed);
 
 gboolean             nm_device_get_autoconnect      (NMDevice *device);
 
+NM_DEPRECATED_IN_1_22
 _NM_DEPRECATED_SYNC_METHOD
 void                 nm_device_set_autoconnect      (NMDevice *device, gboolean autoconnect);