diff --git a/.gitignore b/.gitignore
index a5cc017b1..8307d40fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ __pycache__/
 *.pyc
 waveflag
 build/
+venv/
diff --git a/Makefile b/Makefile
index c0ebd9f51..127c0ce00 100644
--- a/Makefile
+++ b/Makefile
@@ -128,8 +128,6 @@ compressed: $(ALL_COMPRESSED_FILES)
 check_compress_tool:
 ifdef MISSING_ZOPFLI
 	$(error "Missing $(ZOPFLIPNG). Try 'brew install zopfli' (Mac) or 'sudo apt-get zopfli' (linux)")
-else
-	@echo "using $(ZOPFLIPNG)"
 endif
 
 check_vs_adder:
diff --git a/README.md b/README.md
index d6bfa5a0c..01401661d 100644
--- a/README.md
+++ b/README.md
@@ -7,27 +7,25 @@ Building Noto Color Emoji requires:
 - Python 3
 - [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/)
 - [pngquant](https://pngquant.org/)
-- Either [zopflipng](https://github.com/google/zopfli) or [optipng](http://optipng.sourceforge.net/). Zopflipng is better (about 5-10%) but much slower.
+- [zopflipng](https://github.com/google/zopfli)
 
 ## Building NotoColorEmoji
-This project uses a virtual environment to manage dependencies. Use the following steps to get up and running.
+This project uses a virtual environment to manage dependencies. Use the following steps to get up and running:
 
-Create a virtual environment called `noto-emoji-env`:
+```shell
+# make sure you have the Prerequisites
 
-	python3 -m venv noto-emoji-env
+# create & activate a virtual environment
+python3 -m venv venv
+source venv/bin/activate
 
-Activate the virtual environment:
+# install python requirements
+pip install -r requirements.txt
 
-	source noto-emoji-env/bin/activate
+time make -j
+```
 
-Install the Python requirements with:
-	
-	pip install -r requirements.txt
-
-Then run `make`.  NotoColorEmoji is the default target.  It's suggested to use -j,
-especially if you are using zopflipng for compression.  Intermediate products
-(compressed image files, for example) will be put into a build subdirectory; the
-font will be at the top level.
+Intermediate products (compressed image files, for example) will be put into a build subdirectory; the font will be at the top level.
 
 ## Using NotoColorEmoji
 
diff --git a/requirements.txt b/requirements.txt
index 9748ccfa8..4cda58f53 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 fonttools>=4.7.0
--e git://github.com/googlefonts/nototools.git#egg=master
\ No newline at end of file
+notofonttools>=0.2.4
\ No newline at end of file