diff --git a/README.md b/README.md
index 6c4ce24..5c0d618 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ The `quant_module_patched.py` fix is for **modelopt 0.45.0.dev64** specifically.
 
 ## Key Notes
 
-- Use BF16 source — V4's mixed precision causes issues, FP8 source has kernel problems on Blackwell
+- V4 is NOT BF16 — it ships as mixed-precision FP8/FP4. You MUST dequantize to BF16 first (Step 1). The raw FP8 source has kernel problems on Blackwell; the mixed-precision source causes modelopt errors
 - `--low_memory_mode` causes meta device errors with V4 — don't use
 - modelopt has no explicit V4 support — relies on auto-detection of fused experts
 - The `quant_module_patched.py` patch fixes `iter_weights_for_calibration()` for V4's `nn.ModuleList` expert quantizers — already applied in the venv