diff --git a/NOTES b/NOTES
index 72bd5b1..a617a2c 100644
--- a/NOTES
+++ b/NOTES
@@ -496,3 +496,16 @@ FontForge's "Expand stroke" may be useful for converting single-line
 font into something useful.  A 50-unit circular pen generates Bedstead
 Plotter.  A 100×50-unit, 20° rectangular pen generates a surprisingly
 good Bedstead Calligraphic.
+
+Typographers seem to like explaining how to design their languages'
+unique letters:
+
+Æ and æ:
+https://medium.com/@frodefrodefrode/designing-the-letter-%C3%A6-862cffbe22b
+
+Polish characters
+http://www.twardoch.com/download/polishhowto/
+
+ẞ:
+https://typography.guru/journal/capital-sharp-s-designs/
+https://typography.guru/journal/how-to-draw-a-capital-sharp-s-r18/