diff --git a/external/capnp/.gitignore b/external/capnp/.gitignore
new file mode 100644
index 0000000000..cf70b5d13f
--- /dev/null
+++ b/external/capnp/.gitignore
@@ -0,0 +1,4 @@
+bin
+capnproto-c++-0.6.1*
+include
+lib
diff --git a/tools/ubuntu_setup.sh b/tools/ubuntu_setup.sh
index c968e0b7a4..90272ada6f 100755
--- a/tools/ubuntu_setup.sh
+++ b/tools/ubuntu_setup.sh
@@ -51,7 +51,9 @@ pip install pipenv==2018.11.26
 cd ../
 pipenv install --system --deploy
 
-# TODO: add openpilot to PYTHONPATH
+# TODO: add openpilot to PYTHONPATH and external to PATH
 # export PYTHONPATH="$HOME/openpilot"
+# export PATH="$PATH:$HOME/openpilot/external/capnp/bin"
 
+# TODO: run external/capnp/build.sh ... needed?