diff --git a/src/hb-ot-os2-unicode-ranges.hh b/src/hb-ot-os2-unicode-ranges.hh
index 4148342ac..9e06c1006 100644
--- a/src/hb-ot-os2-unicode-ranges.hh
+++ b/src/hb-ot-os2-unicode-ranges.hh
@@ -38,6 +38,7 @@ struct Range {
   unsigned int bit;
 };
 
+/* Note: The contents of this array was generated using util/generate-unicode-ranges.py. */
 static Range os2UnicodeRangesSorted[] = {
   {     0x0,     0x7F,   0}, // Basic Latin
   {    0x80,     0xFF,   1}, // Latin-1 Supplement