diff --git a/src/tokenizer.xfst b/src/tokenizer.xfst
index 0100d6e..742f147 100644
--- a/src/tokenizer.xfst
+++ b/src/tokenizer.xfst
@@ -16,6 +16,7 @@
 
 define Digit [%0|1|2|3|4|5|6|7|8|9];
 define AsciiLetter [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z];
+define HexLetter [Digit|a|A|b|B|c|C|d|D|e|E|f|F];
 define EOT "\u0004";
 
 !!!!!!!!!!!!!!!!!
@@ -110,6 +111,7 @@
 
 define Letter [ [ AsciiLetter | ö | ü | ä | ß ] .o. Caseinsensitive ];
 
+! Abbreviations and Initials
 define Abbr [ @txt"txt/abbrv.txt" | Letter ] %.;
 
 define Plusampersand @txt"txt/plusampersand.txt";
@@ -175,6 +177,7 @@
                 ["m" "p" ["3"|"4"]]|
                 {ogg}|
                 {png}|
+                [{ppt} ("x")]|
                 {avi}|
                 {txt}|
                 {xls}|