diff --git a/ben-cyrillic/files/ben_ru_uni.trans b/ben-cyrillic/files/ben_ru_uni.trans
index 51063a7..5d80073 100644
--- a/ben-cyrillic/files/ben_ru_uni.trans
+++ b/ben-cyrillic/files/ben_ru_uni.trans
@@ -30,6 +30,7 @@
 0xbd U+042D  #  CYRILLIC CAPITAL LETTER E
 0xbe U+042E  #  CYRILLIC CAPITAL LETTER YU
 0xbf U+042F  #  CYRILLIC CAPITAL LETTER YA
+0xa5 U+0401  #  CYRILLIC CAPITAL LETTER IO
 0xc0 U+0430  #  CYRILLIC SMALL LETTER A
 0xc1 U+0431  #  CYRILLIC SMALL LETTER BE
 0xc2 U+0432  #  CYRILLIC SMALL LETTER VE
@@ -62,6 +63,7 @@
 0xdd U+044D  #  CYRILLIC SMALL LETTER E
 0xde U+044E  #  CYRILLIC SMALL LETTER YU
 0xdf U+044F  #  CYRILLIC SMALL LETTER YA
+0xc5 U+0451  #  CYRILLIC SMALL LETTER IO
 
 # ─
 0x82 U+2500  #  BOX DRAWINGS LIGHT HORIZONTAL