diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 687f894d8ca9..4ef4f8a089b5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -43,10 +43,11 @@ Install the [Xcode Command-Line Tools](http://osxdaily.com/2014/02/12/install-co
 ### Linux
 
 1.  Pick your favorite package manager.
-1.  Install `python`
+1.  Install `python` (Python 2.7+)
 1.  Install `gcc`
 1.  Install `g++`
 1.  Install `make`
+1.  Install `git-lfs`
 
 ### All platforms
 
@@ -55,6 +56,7 @@ Now, run these commands in your preferred terminal in a good directory for devel
 ```
 git clone https://github.com/signalapp/Signal-Desktop.git
 cd Signal-Desktop
+git-lfs install                # Setup Git LFS.
 npm install --global yarn      # (only if you don’t already have `yarn`)
 yarn install --frozen-lockfile # Install and build dependencies (this will take a while)
 yarn grunt                     # Generate final JS and CSS assets
@@ -79,6 +81,8 @@ while you make changes:
 yarn grunt dev # runs until you stop it, re-generating built assets on file changes
 ```
 
+If you miss the `git-lfs` step, run `yarn cache clean` and remove `node_modules` before trying again.
+
 ### webpack
 
 Some parts of the app (such as the Sticker Creator) have moved to webpack.