2 files changed, 3 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index 1e2f40b0..692a974d 100644
--- a/Makefile
+++ b/Makefile
@@ -70,8 +70,8 @@ wheel:
 	tox -c tox_wheels.ini $(ARGS)
 
 manylinux:
-	docker run -v `pwd`:/io quay.io/pypa/manylinux1_x86_64 /io/ci/manylinux.sh build
-	docker run -v `pwd`:/io quay.io/pypa/manylinux1_i686 /io/ci/manylinux.sh build
+	docker run --rm -v `pwd`:/io quay.io/pypa/manylinux1_x86_64 /io/ci/manylinux.sh build
+	docker run --rm -v `pwd`:/io quay.io/pypa/manylinux1_i686 /io/ci/manylinux.sh build
 
 kit_upload:
 	twine upload dist/*
diff --git a/howto.txt b/howto.txt
index 2b9e37d1..ab532863 100644
--- a/howto.txt
+++ b/howto.txt
@@ -49,7 +49,7 @@
     - Source kit and wheels:
         - $ make kit wheel
     - Linux wheels:
-        - this takes an hour
+        - this can be fast (3min) or slow (1h45m). not sure why.
         - $ make manylinux
     - Windows kits
         - wait for over an hour for Appveyor to build kits.