diff --git a/shader_deblocking/README.md b/shader_deblocking/README.md
index 999e05d..be4fa90 100644
--- a/shader_deblocking/README.md
+++ b/shader_deblocking/README.md
@@ -35,7 +35,7 @@ You may also want "PyOpenGL_accelerate", and under Linux you may need to also in
 See `run.bat` for the command line on how to run the sample. Or run:
 
 ```
-py -3.12 testbed.py shader.glsl 12 12 flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_0_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_1_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_2_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_3_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_4_face_0_layer_0000.png
+python testbed.py shader.glsl 12 12 flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_0_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_1_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_2_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_3_face_0_layer_0000.png flower_unpacked_rgb_ASTC_LDR_12X12_RGBA_level_4_face_0_layer_0000.png
 ```
 
 Depending on your setup you may need to use 'python' or 'python3' etc.