diff --git a/src/voku/helper/data/ascii_by_languages.php b/src/voku/helper/data/ascii_by_languages.php
index 68c3f9d..f43c2e3 100644
--- a/src/voku/helper/data/ascii_by_languages.php
+++ b/src/voku/helper/data/ascii_by_languages.php
@@ -575,16 +575,17 @@
         'ष'  => 'Shha',
         'ट'  => 'Ta',
         'त'  => 'Ta',
-        'ठ'  => 'Tha',
+        'ठ'  => 'Th',
         'द'  => 'Tha',
-        'थ'  => 'Tha',
-        'ध'  => 'Thha',
-        'ड़' => 'ugDha',
-        'ढ़' => 'ugDhha',
+        'थ'  => 'Th',
+        'ध'  => 'dha',
+        'ड़' => 'da',
+        'ढ़' => 'dha',
         'व'  => 'Va',
         'य'  => 'Ya',
         'य़' => 'Yi',
         'ज़' => 'Za',
+        'ॐ'  => 'om',
     ],
     // Armenian
     'hy' => [