diff --git a/nav2_demo/README.md b/nav2_demo/README.md
index 37456b2..1c1c6ba 100644
--- a/nav2_demo/README.md
+++ b/nav2_demo/README.md
@@ -22,7 +22,7 @@ Start the space_nav2 container and launch the navigation2 nodes:
 
 ```
 ./run.sh
-ros2 launch nav2_bringup navigation_launch.py use_sim_time:=True params_file:=nav2_params.yaml
+ros2 launch space_nav2_bringup navigation_launch.py use_sim_time:=True params_file:=nav2_params.yaml
 ```
 
 ## Terminal 3 - launch localization with map
@@ -30,7 +30,7 @@ ros2 launch nav2_bringup navigation_launch.py use_sim_time:=True params_file:=na
 ```
 docker exec -it osrf_space_nav2_demo bash
 source install/setup.bash
-ros2 launch nav2_bringup localization_launch.py use_sim_time:=True map:=mars_map.yaml
+ros2 launch space_nav2_bringup localization_launch.py use_sim_time:=True map:=mars_map.yaml params_file:=nav2_params.yaml
 ```
 
 ## Terminal 4 - launch Rviz
diff --git a/navigation2/README.md b/navigation2/README.md
index 066ddf2..38c417a 100644
--- a/navigation2/README.md
+++ b/navigation2/README.md
@@ -57,8 +57,8 @@ spaceros-user@ip-your-ip-address:/home/spaceros-user/nav2_ws#
 
 To run the latest demo, see the README in the [nav2_demo](../nav2_demo/README.md) folder.
 
-
 ## Updating navigation2 packages
+
 The `navigation2.repos` file available in this repository provides a list of repos that are required to build the nav2 stack. ROS packages already included in the SpaceROS base image are omited from this file.
 
 To update navigation2 packages used to build the space nav2 image, run the `docker_update_nav2_repos.sh` script:
@@ -69,5 +69,10 @@ To update navigation2 packages used to build the space nav2 image, run the `dock
 
 This will update the `navigation2.repos` file with the newest versions of nav2 packages. The script resolves missing packages in base spaceros image and creates a list with their latest versions. The `navigation2.repos` file is then copied during build to the docker image with space nav2, and packages specified in the file are cloned and installed.
 
-To generate a list of required packages for any other ROS workspace (e.g. your custom workspace built on top of SpaceROS that already has some nav2 dependencies installed), consider using the `update_nav2_repos.sh` as your starting point. You may also need to clone `generate-repos.sh` script from the main spaceros repository.
+By default, this update nav2 repositories using the latest released version of the Space ROS base image (typically `osrf/space-ros:latest`).
+If building locally, the underlying base image can be set in the through the environment with:
+```
+SPACE_ROS_IMAGE=osrf/space-ros:main ./docker_update_nav2_repos.sh
+```
 
+To generate a list of required packages for any other ROS workspace (e.g. your custom workspace built on top of SpaceROS that already has some nav2 dependencies installed), consider using the `update_nav2_repos.sh` as your starting point. You may also need to clone `generate-repos.sh` script from the main spaceros repository.