diff --git a/libnm/nm-client.c b/libnm/nm-client.c
index fd6c35dca..d5ae5d4ac 100644
--- a/libnm/nm-client.c
+++ b/libnm/nm-client.c
@@ -577,6 +577,8 @@ nm_client_connectivity_check_get_uri (NMClient *client)
  * Gets NetworkManager current logging level and domains.
  *
  * Returns: %TRUE on success, %FALSE otherwise
+ *
+ * Deprecated: 1.22, use nm_client_get_logging_async() or GDBusConnection
  **/
 gboolean
 nm_client_get_logging (NMClient *client, char **level, char **domains, GError **error)
@@ -586,6 +588,8 @@ nm_client_get_logging (NMClient *client, char **level, char **domains, GError **
 	g_return_val_if_fail (domains == NULL || *domains == NULL, FALSE);
 	g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
 
+	/* FIXME(libnm-async-api): add nm_client_get_logging_async(). */
+
 	if (!_nm_client_check_nm_running (client, error))
 		return FALSE;
 
@@ -604,6 +608,8 @@ nm_client_get_logging (NMClient *client, char **level, char **domains, GError **
  * Sets NetworkManager logging level and/or domains.
  *
  * Returns: %TRUE on success, %FALSE otherwise
+ *
+ * Deprecated: 1.22, use nm_client_set_logging_async() or GDBusConnection
  **/
 gboolean
 nm_client_set_logging (NMClient *client, const char *level, const char *domains, GError **error)
@@ -611,6 +617,8 @@ nm_client_set_logging (NMClient *client, const char *level, const char *domains,
 	g_return_val_if_fail (NM_IS_CLIENT (client), FALSE);
 	g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
 
+	/* FIXME(libnm-async-api): add nm_client_set_logging_async(). */
+
 	if (!_nm_client_check_nm_running (client, error))
 		return FALSE;
 
diff --git a/libnm/nm-client.h b/libnm/nm-client.h
index 0b3b0e36e..32cbd168a 100644
--- a/libnm/nm-client.h
+++ b/libnm/nm-client.h
@@ -277,10 +277,13 @@ void     nm_client_connectivity_check_set_enabled (NMClient *client,
 NM_AVAILABLE_IN_1_20
 const char *nm_client_connectivity_check_get_uri (NMClient *client);
 
+_NM_DEPRECATED_SYNC_METHOD
 gboolean nm_client_get_logging (NMClient *client,
                                 char **level,
                                 char **domains,
                                 GError **error);
+
+_NM_DEPRECATED_SYNC_METHOD
 gboolean nm_client_set_logging (NMClient *client,
                                 const char *level,
                                 const char *domains,
diff --git a/libnm/nm-manager.h b/libnm/nm-manager.h
index 9b46b6417..e9c09c62c 100644
--- a/libnm/nm-manager.h
+++ b/libnm/nm-manager.h
@@ -112,10 +112,13 @@ void      nm_manager_connectivity_check_set_enabled (NMManager *manager,
 
 const char *nm_manager_connectivity_check_get_uri (NMManager *manager);
 
+_NM_DEPRECATED_SYNC_METHOD_INTERNAL
 gboolean nm_manager_get_logging (NMManager *manager,
                                  char **level,
                                  char **domains,
                                  GError **error);
+
+_NM_DEPRECATED_SYNC_METHOD_INTERNAL
 gboolean nm_manager_set_logging (NMManager *manager,
                                  const char *level,
                                  const char *domains,