Update README.md

petercorke · web-flow · commit d42d8bda7285 · 2020-09-13T09:50:43.000+10:00
diff --git a/roboticstoolbox/models/README.md b/roboticstoolbox/models/README.md
@@ -1,9 +1,9 @@
-There are three types of model supported by the Toolbox, and all are subclasses of the abstract `Robot` superclass.
+The Toolbox supports three types of model. Each is represented by a distinct class which inherits from the abstract `Robot` superclass.
 
 * [Denavit-Hartenberg (DH) models](roboticstoolbox/models/DH). These are defined using standard or modified DH parameters, with optional 3D meshes for visualisation and optional dynamic parameters.
 * [ETS models](roboticstoolbox/models/ETS). There are defined using a sequence of elementary transformations (rotation and translations), and is a quick and intuitive way to describe a robot, see [this article](https://petercorke.com/robotics/a-simple-and-systematic-approach-to-assigning-denavit-hartenberg-parameters/).
 * [URDF models](roboticstoolbox/models/URDF). These models are defined by a Unified Robot Description Format file, an XML format file. Models exist for the classic Puma560 robot as well as the Franka-Emika Panda, the Universal robotics range and all the Interbotix hobby-class robots.
 
 In each folder you will find a README describing how to create your own model.
 
-If you think your model might be interesting to others consider submitting a pull request.
+If you think your model might be interesting to others consider submitting a pull request.
