Cleanup: Add comment about BOM.

diff --git a/level_0/f_utf/c/private-utf_control.c b/level_0/f_utf/c/private-utf_control.c
index aadc3eb991b2f9a353395a4cf2f649d33dfc0796..d6d1a7d4e49a4a9528037911bdffb3d6ae6fd90f 100644 (file)
--- a/level_0/f_utf/c/private-utf_control.c
+++ b/level_0/f_utf/c/private-utf_control.c
@@ -77,6 +77,9 @@ extern "C" {
         return F_true;
       }
 
+      // The U+FEFF is used for the byte order mark (BOM).
+      // The use as a zero-width space is no longer supported as of Unicode 3.2.
+      // The BOM is meaningless in UTF-8.
       // Arabic Presentation Forms-B: U+FEFF.
       if (sequence == 0xefbbbf00) {
         return F_true;