diff --git a/library/model_util.py b/library/model_util.py
index 6a1e656a..778a4c27 100644
--- a/library/model_util.py
+++ b/library/model_util.py
@@ -16,7 +16,7 @@ BETA_END = 0.0120
 UNET_PARAMS_MODEL_CHANNELS = 320
 UNET_PARAMS_CHANNEL_MULT = [1, 2, 4, 4]
 UNET_PARAMS_ATTENTION_RESOLUTIONS = [4, 2, 1]
-UNET_PARAMS_IMAGE_SIZE = 32  # unused
+UNET_PARAMS_IMAGE_SIZE = 64  # fixed from old invalid value `32`
 UNET_PARAMS_IN_CHANNELS = 4
 UNET_PARAMS_OUT_CHANNELS = 4
 UNET_PARAMS_NUM_RES_BLOCKS = 2
diff --git a/tools/convert_diffusers20_original_sd.py b/tools/convert_diffusers20_original_sd.py
index a3cd03fe..6c142848 100644
--- a/tools/convert_diffusers20_original_sd.py
+++ b/tools/convert_diffusers20_original_sd.py
@@ -1,8 +1,4 @@
 # convert Diffusers v1.x/v2.0 model to original Stable Diffusion
-# v1: initial version
-# v2: support safetensors
-# v3: fix to support another format
-# v4: support safetensors in Diffusers
 
 import argparse
 import os