diff --git a/modules/sd_hijack_autoencoder.py b/modules/sd_hijack_autoencoder.py
index ffa72f90d..8e03c7f89 100644
--- a/modules/sd_hijack_autoencoder.py
+++ b/modules/sd_hijack_autoencoder.py
@@ -1,3 +1,7 @@
+# The content of this file comes from the ldm/models/autoencoder.py file of the compvis/stable-diffusion repo
+# The VQModel & VQModelInterface were subsequently removed from ldm/models/autoencoder.py when we moved to the stability-ai/stablediffusion repo
+# As the LDSR upscaler relies on VQModel & VQModelInterface, the hijack aims to put them back into the ldm.models.autoencoder
+
 import torch
 import pytorch_lightning as pl
 import torch.nn.functional as F