Update v2.md

docs/v2.md

@@ -15,6 +15,7 @@ Curious about the new features in the PX4 X-Plane Plugin v2.0.0? Check out this
 - [Setting Up the Environment](#setting-up-the-environment)
 - [Clone and Build PX4](#clone-and-build-px4)
 - [Configuration](#configuration)
+- [Defining Custom Airframes](#defining-custom-airframes)
 - [Additional Tips](#additional-tips)
 
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@@ -121,6 +122,15 @@ px4xplane
 
 The selected airframe will automatically load in X-Plane, and you can manage the configuration through the PX4 SITL menus directly. Manual parameter loading is no longer required for the supported airframes.
 
+---
+## Defining Custom Airframes
+
+If you need to define new airframes for your simulation, follow the detailed guide here:
+
+👉 [How to Define Custom Airframes in PX4-XPlane](https://github.com/alireza787b/px4xplane/blob/master/docs/custom-airframe-config.md)
+
+This guide will walk you through the process of setting up custom configurations, mapping PX4 channels to X-Plane datarefs, and integrating new airframes into your simulations. Whether you're using existing X-Plane models or creating new ones in Plane Maker, this guide has you covered.
+
 ---
 
 ## Additional Tips