diff --git a/NOTES b/NOTES
index 49ec8ac..a0bf60e 100644
--- a/NOTES
+++ b/NOTES
@@ -499,6 +499,9 @@ http://www.twardoch.com/download/polishhowto/
 https://typography.guru/journal/capital-sharp-s-designs/
 https://typography.guru/journal/how-to-draw-a-capital-sharp-s-r18/
 
+Microsoft have their own suggestions:
+https://docs.microsoft.com/en-gb/typography/develop/character-design-standards/
+
 Good bitmap sizes for Bedstead fulfill two characteristics:
 
 1: An integer number of output pixels per Bedstead pixel (so