diff --git a/src/otlayout/otltags.h b/src/otlayout/otltags.h
index a66768219..d954b5851 100644
--- a/src/otlayout/otltags.h
+++ b/src/otlayout/otltags.h
@@ -19,10 +19,12 @@ OTL_SCRIPT_TAG( 'a','r','m','n', "Armenian", ARMENIAN )
 OTL_SCRIPT_TAG( 'b','e','n','g', "Bengali", BENGALI )
 OTL_SCRIPT_TAG( 'b','o','p','o', "Bopomofo", BOPOMOFO )
 OTL_SCRIPT_TAG( 'b','r','a','i', "Braille", BRAILLE )
+OTL_SCRIPT_TAG( 'b','y','z','m', "Byzantine Music", BYZANTINE_MUSIC )
 OTL_SCRIPT_TAG( 'c','a','n','s', "Canadian Syllabic", CANADIAN )
 OTL_SCRIPT_TAG( 'c','h','e','r', "Cherokee", CHEROKEE )
 OTL_SCRIPT_TAG( 'h','a','n','i', "CJK Ideographic", CJK )
 OTL_SCRIPT_TAG( 'c','y','r','l', "Cyrillic", CYRILLIC )
+OTL_SCRIPT_TAG( 'd','f','l','t', "Default", DEFAULT )
 OTL_SCRIPT_TAG( 'd','e','v','a', "Devanagari", DEVANAGARI )
 OTL_SCRIPT_TAG( 'e','t','h','i', "Ethiopic", ETHIOPIC )
 OTL_SCRIPT_TAG( 'g','e','o','r', "Georgian", GEORGIAN )
@@ -32,9 +34,9 @@ OTL_SCRIPT_TAG( 'g','u','r','u', "Gurmukhi", GURMUKHI )
 OTL_SCRIPT_TAG( 'j','a','m','o', "Hangul Jamo", JAMO )
 OTL_SCRIPT_TAG( 'h','a','n','g', "Hangul", HANGUL )
 OTL_SCRIPT_TAG( 'h','e','b','r', "Hebrew", HEBREW )
-OTL_SCRIPT_TAG( 'h','i','r','a', "Hiragana", HIRAGANA )
+OTL_SCRIPT_TAG( 'h','i','r','a', "Hiragana", HIRAGANA ) /* not in TAGS.txt */
 OTL_SCRIPT_TAG( 'k','n','d','a', "Kannada", KANNADA )
-OTL_SCRIPT_TAG( 'k','a','n','a', "Katakana", KATAKANA )
+OTL_SCRIPT_TAG( 'k','a','n','a', "Katakana", KATAKANA ) /* in TAGS.txt, means Hiragana _and_ Katakana */
 OTL_SCRIPT_TAG( 'k','h','m','r', "Khmer", KHMER )
 OTL_SCRIPT_TAG( 'l','a','o',' ', "Lao", LAO )
 OTL_SCRIPT_TAG( 'l','a','t','n', "Latin", LATIN )