diff --git a/docs/manual/prerequisite.txt b/docs/manual/prerequisite.txt
index ac0ab62e35..110fab41fd 100644
--- a/docs/manual/prerequisite.txt
+++ b/docs/manual/prerequisite.txt
@@ -36,6 +36,7 @@ between distributions).
 ** +unzip+
 ** +rsync+
 ** +file+ (must be in +/usr/bin/file+)
+** +bc+
 
 * Source fetching tools:
 ** +wget+