diff --git a/.gitignore b/.gitignore
index 0a21979a..2c184228 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,9 @@
 
 # Sublime
 *.sublime*
+
+Dockerfile
+DOCKER_README.md
+docker-compose.yml
+run_demo.sh
+.dockerignore
diff --git a/README.md b/README.md
index 65b3ffbc..0e94ba18 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,7 @@ The robot-centric elevation mapping methods used in this software are described
 This software is built on the Robotic Operating System ([ROS]), which needs to be [installed](http://wiki.ros.org) first. Additionally, the Robot-Centric Elevation Mapping depends on following software:
 
 - [Grid Map](https://github.com/anybotics/grid_map) (grid map library for mobile robots)
+    (Important  - Clone branch melodic-devel for ros 1)
 - [kindr](http://github.com/anybotics/kindr) (kinematics and dynamics library for robotics),
 - [kindr_ros](https://github.com/anybotics/kindr_ros) (ROS wrapper for kindr),
 - [Point Cloud Library (PCL)](http://pointclouds.org/) (point cloud processing),