diff --git a/zamba/pytorch_lightning/utils.py b/zamba/pytorch_lightning/utils.py
index 40473dca..be397b76 100644
--- a/zamba/pytorch_lightning/utils.py
+++ b/zamba/pytorch_lightning/utils.py
@@ -6,6 +6,7 @@
 
 import numpy as np
 import pandas as pd
+import pytorch_lightning as pl
 from pytorch_lightning import LightningDataModule, LightningModule
 from sklearn.metrics import f1_score, top_k_accuracy_score, accuracy_score
 import torch
@@ -273,9 +274,17 @@ def configure_optimizers(self):
             }
 
     def to_disk(self, path: os.PathLike):
+        """Save out model weights to a checkpoint file on disk.
+
+        Note: this does not include callbacks, optimizer_states, or lr_schedulers.
+        To include those, use `Trainer.save_checkpoint()` instead.
+        """
+
         checkpoint = {
             "state_dict": self.state_dict(),
             "hyper_parameters": self.hparams,
+            "global_step": self.global_step,
+            "pytorch-lightning_version": pl.__version__,
         }
         torch.save(checkpoint, path)