Update modes.md

Author: masagrator

docs/modes.md

@@ -106,7 +106,9 @@ If game is not launched, it will show always 254.0 value and graph will be empty
 If game is not rendering any new frame, graph is not updated.
 
 If line is within rounding error of graph line, it's colored. Average FPS must be between -0.05 and +0.04 of graph line target FPS. So for 30 FPS it's between 29.95 - 30.04 FPS. For 43 FPS it's 42.95 - 43.04 FPS.
-If it's in 30 or 60 FPS rounding error range, it's green. Any other FPS graph target is purple.
+If it's in display refresh rate or half of it rounding error range, it's green. Any other FPS graph target is purple.
+
+Colors can be changed in config file.
 
 Mode available only with SaltyNX installed.