README: Add note on how to force install things in venv

1 files changed, 4 insertions, 1 deletions

diff --git a/README.md b/README.md
index 0a24153..67ae5af 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,10 @@ virtualenv --python python3 venv
 3. Install the required packages
 
 ```bash
-pip install -r requirements.txt
+# The --ignore-installed flag forces packages to
+# get installed in the venv even if they existed 
+# in the global env
+pip install -r requirements.txt --ignore-installed
 ```
 
 #### Using guix