diff --git a/doc/building-the-code.txt b/doc/building-the-code.txt
index 8f29ac1..79421a0 100644
--- a/doc/building-the-code.txt
+++ b/doc/building-the-code.txt
@@ -9,7 +9,7 @@
 You also have to follow the directions at
   <http://backports-master.debian.org/Instructions/>.
 Then, run `apt-get install subversion git g++-multilib gcc-multilib ruby patch \
-    make openjdk-6-jdk lib32event-dev python`
+    make openjdk-6-jdk lib32event-dev python unzip`
   and `apt-get install -t squeeze-backports swig` (package lists correct for
   amd64 Squeeze; you might be able to get it to build on other
   versions/platforms/distributions (Ubuntu, Mint, ...) if you can find the