diff --git a/scaden/__main__.py b/scaden/__main__.py
index e3deeba..580d27b 100644
--- a/scaden/__main__.py
+++ b/scaden/__main__.py
@@ -56,9 +56,11 @@ def cli():
                 type=click.Path(exists=True),
                 required=True,
                 metavar='<training data>')
-@click.option('--train_datasets',
-              default='',
-              help='Datasets used for training. Uses all by default.')
+@click.option(
+    '--train_datasets',
+    default='',
+    help=
+    'Comma-separated list of datasets used for training. Uses all by default.')
 @click.option('--model_dir', default="./", help='Path to store the model in')
 @click.option('--batch_size',
               default=128,
diff --git a/scaden/train.py b/scaden/train.py
index 1d32d24..1694b54 100644
--- a/scaden/train.py
+++ b/scaden/train.py
@@ -48,7 +48,7 @@ def training(data_path,
     if train_datasets == '':
         train_datasets = []
     else:
-        train_datasets = train_datasets.split()
+        train_datasets = train_datasets.split(',')
         print(f"Training on: {train_datasets}")
 
     # Training of M256 model