Update README.md

Author: jjacobson95

build/README.md

@@ -56,21 +56,22 @@ It requires the following authorization tokens to be set in the local environmen
 `SYNAPSE_AUTH_TOKEN`: Required for beataml and mpnst datasets. Follow the directions above to use gain access.
 
 Available arguments:
-- `--dataset`: Required. Name of the dataset to build.
+- `--dataset`: Required. Name of the dataset to build. At a minimum, this will build the docker images.
 - `--use_prev_dataset`: Optional. Prefix of the previous dataset for sample and drug ID continuation. The previous dataset files must be in the "local" directory.
-- `--validate`: Optional. Runs the schema checker on the built files.
+- `--build`: Optional. Build the desired Dataset.
+- `--validate`: Optional. Run the schema checker on the built files.
 - `--continue`: Optional. Continues from where the build left off by skipping existing files in "local" directory.
 Example usage:
 
 Build the broad_sanger dataset:
 ```bash
-python build/build_dataset.py --dataset broad_sanger
+python build/build_dataset.py --build --dataset broad_sanger
 ```
 Build the mpnst dataset continuing from broad_sanger sample and drug IDs:
 ```bash
-python build/build_dataset.py --dataset mpnst --use_prev_dataset broad_sanger
+python build/build_dataset.py --build --dataset mpnst --use_prev_dataset broad_sanger
 ```
-Build the hcmi dataset and run validation:
+Build run schema validation on hcmi dataset:
 ```bash
 python build/build_dataset.py --dataset hcmi --validate
 ```