diff --git a/.travis.yml b/.travis.yml
index 9ed2bf6..539ef6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq automake pkg-config build-essential libtool automake autoconf m4 gnulib
   - sudo apt-get install -qq check libpcre3 libpcre3-dev libjemalloc-dev libjemalloc1
+  - sudo apt-get install -qq graphviz-dev graphviz 
 before_script:
   #  - aclocal
   #  - autoconf
diff --git a/README.md b/README.md
index aa94fd6..6f9aa29 100644
--- a/README.md
+++ b/README.md
@@ -198,7 +198,8 @@ if ( $error ) {
 Install
 ----------------------
 
-    sudo apt-get install check libpcre3 libpcre3-dev libjemalloc-dev libjemalloc1 build-essential libtool automake autoconf graphviz-dev graphviz pkg-config
+    sudo apt-get install check libpcre3 libpcre3-dev libjemalloc-dev libjemalloc1 build-essential libtool automake autoconf pkg-config
+    sudo apt-get install graphviz-dev graphviz  # if you want graphviz
     ./autogen.sh
     ./configure && make
     make check # run tests