diff --git a/.travis.yml b/.travis.yml
index 430eb1af067978fbf14789cb3c95c752e797bc86..d39802d69b3a5b35686ca63a8d66a0a964fc7a0d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,20 +4,7 @@ sudo: false
 
 env:
   global:
-    # Set this to cache your build results in cachix for faster builds
-    # in travis and for everyone who uses your cache.
-    #
-    # Format: Your cachix cache host name without the ".cachix.org" suffix.
-    # Example: mycache (for mycache.cachix.org)
-    #
-    # For this to work, you also need to set the  CACHIX_SIGNING_KEY
-    # in your repository settings in Travis.
     - CACHIX_CACHE=
-    # Set this to notify the global nur package registry that changes are
-    # available.
-    #
-    # The repo name as used in
-    # https://github.com/nix-community/NUR/blob/master/repos.json
     - NUR_REPO=<YOUR_NUR_REPO_NAME_HERE>
 
 matrix:
diff --git a/README.md b/README.md
index e719544e5110e86096350842128190e26732fdd4..f1b2c4e054fd63b51b5831c8ac50a328fea6e378 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,8 @@      attribute, or travis (and consequently caching) will fail!
    * Library functions, modules and overlays go in the respective directories
 3. Add your NUR repo name and your cachix repo name (optional) to
    [.travis.yml](./.travis.yml)
+   * If you use cachix you should also add your cache's private key to travis'
+     protected env variables
 4. Enable travis for your repo
    * You can add a cron job in the repository settings on travis to keep your
      cachix cache fresh