1 files changed, 1 insertions, 1 deletions
diff --git a/howto.txt b/howto.txt
index 02b8406c..318b8bc5 100644
--- a/howto.txt
+++ b/howto.txt
@@ -26,7 +26,7 @@
     $ pip install -e .
     $ cd ~/cog/trunk
     $ rm -rf htmlcov
-    $ coverage run --branch --source=cogapp -m pytest -k CogTestsInMemory; coverage combine; coverage html
+    $ PYTEST_ADDOPTS= coverage run --branch --source=cogapp -m pytest -k CogTestsInMemory; coverage combine; coverage html
     - IF PRE-RELEASE:
         $ rm -f ~/coverage/trunk/doc/sample_html_beta/*.*
         $ cp -r htmlcov/ ~/coverage/trunk/doc/sample_html_beta/