diff --git a/README.md b/README.md
index 6c439aff..eb06ca89 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,12 @@
 git clone --recursive https://github.com/function2-llx/MMMM.git
 cd MMMM
 mamba env create -f environment.yaml
-BUILD_MONAI=1 pip install -e third-party/LuoLib/third-party/MONAI
+BUILD_MONAI=1 pip install --no-build-isolation -e third-party/LuoLib/third-party/MONAI
 mamba activate mmmm
-echo "export PYTHONPATH=$PWD:$PWD/third-party/LuoLib" >> $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
+echo \
+"export PYTHONPATH=$PWD:$PWD/third-party/LuoLib
+export BUILD_MONAI=1" \
+>> $CONDA_PREFIX/etc/conda/activate.d/env_vars.sh
+
 ```
+, and build xformers from source / install pre-built wheel.
diff --git a/environment.yaml b/environment.yaml
index 54c3f46c..c6ea1935 100644
--- a/environment.yaml
+++ b/environment.yaml
@@ -28,3 +28,4 @@ dependencies:
   - pip:
     - cytoolz
     - jsonargparse[signatures, omegaconf]
+    # - xformers --index-url https://download.pytorch.org/whl/cu118