add missing dependencies to README, fixes #151
diff --git a/README.md b/README.md
index 9f51139317f..87d1df0cd52 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ In general:
 
 ```
 sudo apt-get install python python-setuptools python-virtualenv \
-  python-dev gcc swig dialog libaugeas0 libssl-dev
+  python-dev gcc swig dialog libaugeas0 libssl-dev ca-certificates
 ```
 
 #### Mac OSX
