Update README.md

README.md

@@ -85,6 +85,7 @@ An accurate curve mapping does depend on Window's _SDR content brightness_ value
 
 ## Notes
 
+- The gamma ramp correction will persist when toggling HDR (including via the keyboard shortcut), making SDR appear darker. When disabling HDR, make sure to re-apply your SDR color profile in the Color Management utility. Likewise, when re-enabling HDR, make sure to re-apply to corrective color profile.
 - All profiles are tagged with a peak luminance of 800 nits and a black level of 0
 - Pixel values above diffuse SDR white are untouched; a soft shoulder was added toward unity to blend the curve mapping with HDR values
 - Tested on an LG C2 OLED