diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 54b75d29..b8544366 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -148,7 +148,7 @@ To update one of the dependencies shared across all `repo2docker` builds, you
 must follow these steps (with more detailed information in the sections below):
 
 * Make sure you have [Docker](https://www.docker.com/) running on your computer
-* Bump the version number in the `conda` environment ([link](https://github.com/jupyter/repo2docker/blob/master/CONTRIBUTING.md#conda-dependencies))
+* Bump the version numbers of the dependencies you want to update in the `conda` environment ([link](https://github.com/jupyter/repo2docker/blob/master/CONTRIBUTING.md#conda-dependencies))
 * Make a pull request with your changes ([link](https://github.com/jupyter/repo2docker/blob/master/CONTRIBUTING.md#make-a-pull-request))
 
 See the subsections below for more detailed instructions.
@@ -175,7 +175,8 @@ See the subsections below for more detailed instructions.
    an existing package, you should then run:
 
    ```bash
-   python ./repo2docker/buildpacks/conda/freeze.py
+   cd ./repo2docker/buildpacks/conda/
+   python freeze.py
    ```
 
    This script will resolve dependencies and write them to the respective `.frozen.yml`