diff --git a/Lib/gflanguages/data/languages/abn_Latn.textproto b/Lib/gflanguages/data/languages/abn_Latn.textproto
index 08469ce8..a399afdf 100644
--- a/Lib/gflanguages/data/languages/abn_Latn.textproto
+++ b/Lib/gflanguages/data/languages/abn_Latn.textproto
@@ -7,7 +7,9 @@ population: 25000
 region: "NG"
 exemplar_chars {
   base: "A Ạ B Ḅ D Ḍ E Ẹ F G H I Ị J K L M N O Ọ P R S T U Ụ V W Y Z a ạ b ḅ d ḍ e ẹ f g h i ị j k l m n o ọ p r s t u ụ v w y z"
-  marks: "◌̣"
+  auxiliary: "á Á {ạ́} {Ạ́} é É {ẹ́} {Ẹ́} í Í {ị́} {Ị́} ó Ó {ọ́} {Ọ́} ú Ú {ụ́} {Ụ́} ā Ā {ạ̄} {Ạ̄} ē Ē {ẹ̄} {Ẹ̄} ī Ī {ị̄} {Ị̄} ō Ō {ọ̄} {Ọ̄} ū Ū {ụ̄} {Ụ̄}"
+  marks: "◌́ ◌̄ ◌̣"
 }
 source: "Ethelbert Emmanuel Kari, Kiikpoye Johnny Joshua, \"Abuan orthography\", in Tony Enyia, Orthographies of Nigerian Languages: Manual IX, Nigerian Educational Research and Development Council (NERDC), 2011, p. 1–12"
 source: "Wikipedia"
+note: "Kari & Kiikoye 2011 p. 8-9 indicates tones can be marked (with acute for high tone, macron for downstepped-high tone) in technical works or advanced works like grammars, dictionaries, or literary texts such as poems."