diff --git a/project/ui/qprof-ui.ipynb b/project/ui/qprof-ui.ipynb
index 10c229c2..541f0baa 100644
--- a/project/ui/qprof-ui.ipynb
+++ b/project/ui/qprof-ui.ipynb
@@ -1640,6 +1640,19 @@
    },
    "outputs": [],
    "source": [
+    "explain_warning = widgets.HTML(\"\"\"\n",
+    "<style>\n",
+    ".warning {\n",
+    "  padding: 5px;\n",
+    "  background-color: orange;\n",
+    "  color: white;\n",
+    "}\n",
+    "</style>\n",
+    "<div class=\"warning\">\n",
+    "  <strong>Warning:</strong> Correct EXPLAIN output depends on being connected to the same database where the query was run, or an equivalent database.\n",
+    "</div>\n",
+    "\"\"\")\n",
+    "\n",
     "if comparison:\n",
     "    button_run_explain_plan_1 = widgets.Button(description=\"Run Explain Plan\")\n",
     "    explain_output_1 = widgets.Output()\n",
@@ -1710,6 +1723,7 @@
     "    </body>\n",
     "    \"\"\")    \n",
     "    explain_plan_widget = widgets.HBox([left_side,vertica_border_line, right_side])\n",
+    "    explain_plan_widget = widgets.VBox([explain_warning, explain_plan_widget])\n",
     "else:\n",
     "    button_run_explain_plan = widgets.Button(description=\"Run Explain Plan\")\n",
     "    explain_output = widgets.Output()\n",
@@ -1735,7 +1749,7 @@
     "            qprof.get_qplan_explain()\n",
     "    \n",
     "    button_run_explain_plan.on_click(on_button_clicked_run_explain_plan)\n",
-    "    explain_plan_widget = widgets.VBox([explain_dropdown, button_run_explain_plan, explain_output]) \n",
+    "    explain_plan_widget = widgets.VBox([explain_warning, explain_dropdown, button_run_explain_plan, explain_output]) \n",
     "    "
    ]
   },