diff --git a/docs/manual/prerequisite.txt b/docs/manual/prerequisite.txt
index 40071491f8..763fe79041 100644
--- a/docs/manual/prerequisite.txt
+++ b/docs/manual/prerequisite.txt
@@ -23,6 +23,7 @@ between distributions).
 ** +make+ (version 3.81 or any later)
 ** +binutils+
 ** +build-essential+ (only for Debian based systems)
+** +diffutils+
 ** +gcc+ (version 4.8 or any later)
 ** `g++` (version 4.8 or any later)
 ** +bash+