diff --git a/README.md b/README.md
index 6c3a52ee1..edce81f11 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,8 @@ The color version must be built from source.
 Building NotoColorEmoji requires a few files from nototools.  Clone a copy from
 https://github.com/googlei18n/nototools and either put it in your PYTHONPATH or
 use 'python setup.py develop' ('install' currently won't fully install all the
-data used by nototools).
+data used by nototools).  You will also need fontTools, get it from
+https://github.com/behdad/fonttools.git.
 
 Then run make.  NotoColorEmoji is the default target.  It's suggested to use -j,
 especially if you are using zopflipng for compression.  Intermediate products