diff --git a/cvat/apps/engine/task.py b/cvat/apps/engine/task.py
index c26c9ebd..e1b2b1ff 100644
--- a/cvat/apps/engine/task.py
+++ b/cvat/apps/engine/task.py
@@ -402,10 +402,12 @@ def _parse_labels(labels):
                     raise ValueError("labels string is not corect. " +
                         "`{}` attribute has incorrect value.".format(attr['name']))
             elif attr['type'] == 'number': # <prefix>number=name:min,max,step
-                if not (len(values) == 3 and values[0].isdigit() and \
-                    values[1].isdigit() and values[2].isdigit() and \
-                    int(values[0]) < int(values[1])):
-                    raise ValueError("labels string is not corect. " +
+                try:
+                    if len(values) != 3 or float(values[2]) <= 0 or \
+                        float(values[0]) >= float(values[1]):
+                        raise ValueError
+                except ValueError:
+                    raise ValueError("labels string is not correct. " +
                         "`{}` attribute has incorrect format.".format(attr['name']))
 
             if attr['name'] in parsed_labels[last_label]:
diff --git a/cvat/apps/engine/views.py b/cvat/apps/engine/views.py
index 6c49e284..190885c7 100644
--- a/cvat/apps/engine/views.py
+++ b/cvat/apps/engine/views.py
@@ -260,6 +260,7 @@ def save_annotation_for_job(request, jid):
         if 'logs' in data:
             for event in json.loads(data['logs']):
                 clogger.job[jid].info(json.dumps(event))
+        slogger.job[jid].info("annotation have been saved for the {} job".format(jid))
     except RequestException as e:
         slogger.job[jid].error("cannot send annotation logs for job {}".format(jid), exc_info=True)
         return HttpResponseBadRequest(str(e))