diff --git a/README.md b/README.md
index cec331d..69791e5 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Installation
 ------------
 
 ```
-apt-get install lmdb-utils
+apt-get install lmdb-utils bc
 git clone https://gogs.zionetrix.net/bn8/check_mdb.git /usr/local/src/check_mdb
 mkdir -p /usr/local/lib/nagios/plugins
 ln -s /usr/local/src/check_mdb/check_mdb /usr/local/lib/nagios/plugins/