diff --git a/README.md b/README.md
index 561805e..90f7184 100644
--- a/README.md
+++ b/README.md
@@ -123,7 +123,7 @@ The value to pass 'setPanelBrightness' is the RGB Matrix's pixel width or less.
 
 HOWEVER, by default the library uses a brightness level of '16' so there's really no need to call .setPanelBrightness, unless you specifically want a super bright display.
 
-Summary: setPanelBrightness(xx) value can be any number from 0 to MATRIX_WIDTH-1. 
+Summary: setPanelBrightness(xx) value can be any number from 0 to MATRIX_WIDTH-1. So if you are chaining multiple 64x32 panels, then this value may actually be > 64 (or you will have a dim display).
 
 ![It's better in real life](image.jpg)