Update README.md

Author: zabealbe

README.md

@@ -1,5 +1,7 @@
 Attach two Gazebo models with a virtual joint in a generalized grasp hack
 
+This is a fork of the original [pal-robotics/gazebo_ros_link_attacher](https://github.com/pal-robotics/gazebo_ros_link_attacher) with an important fix for the well-known segmentation fault issue during detach.
+
 # Build
 
 ````
@@ -77,4 +79,4 @@ Aborted (core dumped)
 [Gripper.hh](https://bitbucket.org/osrf/gazebo/src/1d1e3a542af81670f43a120e1df7190592bc4c0f/gazebo/physics/Gripper.hh?at=default&fileviewer=file-view-default)
 [Gripper.cc](https://bitbucket.org/osrf/gazebo/src/1d1e3a542af81670f43a120e1df7190592bc4c0f/gazebo/physics/Gripper.cc?at=default&fileviewer=file-view-default)~~
 
-~~Which is to create a revolute joint on the first model (with range of motion 0) linking a link on the first model and a link on the second model.~~
+~~Which is to create a revolute joint on the first model (with range of motion 0) linking a link on the first model and a link on the second model.~~