1 files changed, 1 insertions, 1 deletions
diff --git a/README b/README
index 2e713ffe..2c7703a1 100644
--- a/README
+++ b/README
@@ -58,7 +58,7 @@ will install all prerequisites for building yosys:
 
 	$ yosys_deps="git g++ clang make bison flex libreadline-dev
 	              tcl8.5-dev zlib1g-dev libqt4-dev libffi-dev
-	              mercurial iverilog graphviz"
+	              mercurial iverilog graphviz xdot"
 	$ sudo apt-get install $yosys_deps
 
 There are also pre-compiled packages for Yosys on Ubuntu. Visit the Yosys