diff --git a/README.md b/README.md
index 95f19d7..d5849f4 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ All scenarios:
  - `./scenarios/garage-s3lat [garage-v0.7|garage-v0.8]` - Run s3lat on Garage
  - `./scenarios/garage-concurrent [garage-v0.7|garage-v0.8]` - Run s3concurrent on Garage
  - `./scenarios/garage-warp [garage-v0.7|garage-v0.8] [default|fast]` - Run warp on Garage. 2 flavors are available: fast and default.
+ - `./scenarios/garage-s3billion [garage-v0.7|garage-v0.8]` - Run s3billion on Garage
 
 *Scenarios take optional flavors as input that modulate their behavioir. Passing them is not mandatory,
 a default one will be selected for you.*
diff --git a/prepare.py b/prepare.py
index e7021ea..bcb3353 100755
--- a/prepare.py
+++ b/prepare.py
@@ -23,7 +23,7 @@ os.chdir(me)
 print("--- install python dependencies ---")
 venv.create(".venv", with_pip=True)
 shared.exec("""
-source .venv/bin/activate
+. .venv/bin/activate
 which python3
 python3 -m pip install .
 python3 -m pip install -r scenarios/requirements.txt
@@ -36,6 +36,6 @@ flavor.download()
 print(f"""done! now, run:
 > sudo -i
 > cd {os.getcwd()}
-> source ./.venv/bin/activate
+> . ./.venv/bin/activate
 > ./mknet scenario ./topo/with-vdsl.yml ./scenarios/garage-s3lat garage-v0.8
 """)