diff --git a/vllm/model_executor/models/tpu/gemma.py b/vllm/model_executor/models/tpu/gemma.py
index 8242f29551f1e..56c0701b864f6 100644
--- a/vllm/model_executor/models/tpu/gemma.py
+++ b/vllm/model_executor/models/tpu/gemma.py
@@ -1,5 +1,8 @@
 """Inference-only Gemma model compatible with HF weights.
 
+Adapted from
+https://github.com/google/gemma_pytorch/blob/main/gemma/model_xla.py
+
 NOTE(woosuk): This is a temporary workaround to run the Gemma model using
 PyTorch XLA. This should be merged into the main Gemma model implementation
 once the custom ops are refactored and the model becomes torch.compile-able.