--- a/data/filetype_extensions.conf
+++ b/data/filetype_extensions.conf
@@ -5,6 +5,7 @@
 Abc=*.abc;*.abp;
 ActionScript=*.as;
 Ada=*.adb;*.ads;
+Asciidoc=*.asciidoc;
 ASM=*.asm;
 CAML=*.ml;*.mli;
 C=*.c;*.h;