gh-95205: Improve wasm README (GH-95206)

miss-islington · Erlend Egeberg Aasland · web-flow · commit df95ad3d721f · 2022-07-25T02:52:47.000-07:00
Co-authored-by: Christian Heimes <christian@python.org> (cherry picked from commit 310f948) Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>
diff --git a/Tools/wasm/README.md b/Tools/wasm/README.md
@@ -23,16 +23,20 @@ to a repository checkout.
 Christian Heimes maintains a container image with Emscripten SDK, Python
 build dependencies, WASI-SDK, wasmtime, and several additional tools.
 
+From within your local CPython repo clone, run one of the following commands:
+
 ```
 # Fedora, RHEL, CentOS
-podman run --rm -ti -v $(pwd):/python-wasm/cpython:Z quay.io/tiran/cpythonbuild:emsdk3
+podman run --rm -ti -v $(pwd):/python-wasm/cpython:Z -w /python-wasm/cpython quay.io/tiran/cpythonbuild:emsdk3
 
 # other
-docker run --rm -ti -v $(pwd):/python-wasm/cpython quay.io/tiran/cpythonbuild:emsdk3
+docker run --rm -ti -v $(pwd):/python-wasm/cpython -w /python-wasm/cpython quay.io/tiran/cpythonbuild:emsdk3
 ```
 
 ### Compile a build Python interpreter
 
+From within the container, run the following commands:
+
 ```shell
 mkdir -p builddir/build
 pushd builddir/build
