diff --git a/src/octoprint/templates/dialogs/settings/gcodevisualizer.jinja2 b/src/octoprint/templates/dialogs/settings/gcodevisualizer.jinja2
index da1e0d17..24f286fd 100644
--- a/src/octoprint/templates/dialogs/settings/gcodevisualizer.jinja2
+++ b/src/octoprint/templates/dialogs/settings/gcodevisualizer.jinja2
@@ -10,7 +10,7 @@
         <label class="control-label" for="settings-gcodeviewer">{{ _('GCode Visualizer file size threshold') }}</label>
         <div class="controls">
             <div class="input-append">
-                    <input type="text" class="input-mini text-right" data-bind="value: feature_sizeThreshold_str">
+                <input type="text" class="input-mini text-right" data-bind="value: feature_sizeThreshold_str">
             </div>
             <span class="help-inline">{{ _('on desktop')}}</span>
         </div>
@@ -20,5 +20,10 @@
             </div>
             <span class="help-inline">{{ _('on mobile')}}</span>
         </div>
+        <div class="controls">
+            <span class="help-inline">
+                {% trans %}Provide values including size unit. Allowed units are: b, byte, bytes, kb, mb, gb, tb (case insensitive). Example: <code>5MB</code>, <code>500KB</code>{% endtrans %}
+            </span>
+        </div>
     </div>
-</form>
\ No newline at end of file
+</form>