diff --git a/util/text.py b/util/text.py
index d3be7eb8..253d2291 100644
--- a/util/text.py
+++ b/util/text.py
@@ -33,9 +33,9 @@ class Alphabet(object):
             return self._str_to_label[string]
         except KeyError as e:
             raise KeyError(
-                'ERROR: Your transcripts contain characters (e.g. \'{}\') which do not occur in data/alphabet.txt! Use ' \
+                'ERROR: Your transcripts contain characters (e.g. \'{}\') which do not occur in \'{}\'! Use ' \
                 'util/check_characters.py to see what characters are in your [train,dev,test].csv transcripts, and ' \
-                'then add all these to data/alphabet.txt.'.format(string)
+                'then add all these to \'{}\'.'.format(self._config_file, string, self._config_file)
             ).with_traceback(e.__traceback__)
 
     def has_char(self, char):