diff --git a/README.md b/README.md
index 8141cf0..ecb922d 100644
--- a/README.md
+++ b/README.md
@@ -976,7 +976,7 @@ Or download from a keyserver:
 You may get an error `gpgkeys: HTTP fetch error 1: unsupported protocol` -- this means you need to install a special version of curl which supports gnupg:
 
 ```
-sudo apt-get install gnupg-curl
+$ sudo apt-get install gnupg-curl
 ```
 
 ## Insert YubiKey