diff --git a/model_manager/sientia/utils.py b/model_manager/sientia/utils.py
index 38d5582..fd6b1c4 100644
--- a/model_manager/sientia/utils.py
+++ b/model_manager/sientia/utils.py
@@ -15,15 +15,20 @@ def split_train_test(
     """
     Split arrays or matrices into random train and test subsets.
 
+    Wrapper for sklearn.model_selection.train_test_split.
+
     Args:
-        *data: data to be splitted.
+        *data: data to be split.
         test_size: size of test subset.
         train_size: size of train subset.
         random_state: Seed applied to the data before applying the split.
         shuffle: Whether or not to shuffle the data before splitting.
         stratify: If not None, data is split in a stratified fashion, using this as the class labels.
+
     Returns:
         X_train, X_test, y_train, y_test
+
+    Thread-safe: This function is stateless and thread-safe.
     """
     X_train, X_test, y_train, y_test = train_test_split(
         *data,