Add preLaunchTask example

release-notes/v1_14.md

@@ -216,7 +216,33 @@ Many cool features come with the new task format:
 
 * We are working with extension providers to add dotnet, Maven and others in the future.
 
-*  As you can see from the image above, auto-detected tasks are prefixed with the type of task ('npm:', 'gulp:', 'grunt:', 'tsc:', or 'jake:'). If you are referencing an auto-detected task in another file, for example as a `preLaunchTask` in `launch.json`, you will need to update that task reference with the prefix.
+*  As you can see from the image above, auto-detected tasks are prefixed with the type of task ('npm:', 'gulp:', 'grunt:', 'tsc:', or 'jake:'). If you are referencing an auto-detected task in another file, for example as a `preLaunchTask` in `launch.json`, you will need to update that task reference with the prefix. Assuming you have the following `launch.json` and the "build" task comes from a gulp file,
+
+```json
+{
+    "version": "0.1.0",
+    "configurations": [
+        {
+            ...
+            "preLaunchTask": "build"
+        }
+    ]
+}
+```
+
+you now need to change this to:
+
+```json
+{
+    "version": "0.1.0",
+    "configurations": [
+        {
+            ...
+            "preLaunchTask": "gulp: build"
+        }
+    ]
+}
+```
 
 * Guided problem matcher selection when executing a task without one: