diff --git a/Getting-Started.md b/Getting-Started.md
index 86f5a24..de5db16 100644
--- a/Getting-Started.md
+++ b/Getting-Started.md
@@ -448,12 +448,17 @@ io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
 ```
 At the end of your render loop, generally after rendering your main viewport but before presenting/swapping it:
 ```cpp
-// Update and Render additional Platform Windows
-ImGui::UpdatePlatformWindows();
-ImGui::RenderPlatformWindowsDefault();
+if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+{
+    // Update and Render additional Platform Windows
+    ImGui::UpdatePlatformWindows();
+    ImGui::RenderPlatformWindowsDefault();
+
+    // TODO for OpenGL: restore current GL context.
+}
 ```
 
-Note that there may be additional calls required surrounding this depending on the backend you are using (OpenGL in particular). Check the [example project](https://github.com/ocornut/imgui/tree/docking/examples) appropriate to your setup for details.
+Note that there may be additional calls required surrounding this depending on the backend you are using (**OpenGL in particular needs backup/restore of current GL context**). Check the [example project](https://github.com/ocornut/imgui/tree/docking/examples) appropriate to your setup for details.
 
 ## Once you are setup...