diff --git a/README.md b/README.md
index 28b31df5768e56301c7955be14959a6c0b275bef..f7d85a7ed885f8334b9c57679820db5838a181b0 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ program called `amber`.
 
 To install on Debian or Ubuntu (Wheezy or later):
 
-    sudo apt-get install ruby ruby-dev
+    sudo apt-get install ruby ruby-dev libz-dev
     sudo gem install amber
 
 To install on Mac, see below. Check https://github.com/leapcode/amber for more
@@ -277,4 +277,4 @@ Alternately, if you want different versions of ruby installed, consider:
 Installing on Windows
 ----------------------------------------
 
-Windows is not yet supported.
\ No newline at end of file
+Windows is not yet supported.