diff --git a/README.md b/README.md
index e637615..b936d46 100644
--- a/README.md
+++ b/README.md
@@ -32,13 +32,13 @@ source repository and the installation directory. To change the
 installation directory:
 
 ```bash
-$ PRELUDE_INSTALL_DIR="$HOME/.emacs.d" && curl -L https://github.com/bbatsov/prelude/raw/master/utils/installer.sh | sh
+$ export PRELUDE_INSTALL_DIR="$HOME/.emacs.d" && curl -L https://github.com/bbatsov/prelude/raw/master/utils/installer.sh | sh
 ```
 
 To change the source repository:
 
 ```bash
-$ PRELUDE_URL="https://github.com/yourname/prelude.git" && curl -L https://github.com/bbatsov/prelude/raw/master/utils/installer.sh | sh
+$ export PRELUDE_URL="https://github.com/yourname/prelude.git" && curl -L https://github.com/bbatsov/prelude/raw/master/utils/installer.sh | sh
 ```
 
 Note that the installer will back up any existing `.emacs` file or