diff --git a/doc/src/sgml/pgtrgm.sgml b/doc/src/sgml/pgtrgm.sgml
new file mode 100644
index 18f0f3e..30e5355
*** a/doc/src/sgml/pgtrgm.sgml
--- b/doc/src/sgml/pgtrgm.sgml
***************
*** 9,15 ****
  
   <para>
    The <filename>pg_trgm</filename> module provides functions and operators
!   for determining the similarity of text based on trigram matching, as
    well as index operator classes that support fast searching for similar
    strings.
   </para>
--- 9,16 ----
  
   <para>
    The <filename>pg_trgm</filename> module provides functions and operators
!   for determining the similarity of <acronym>ASCII</>
!   alphanumeric text based on trigram matching, as
    well as index operator classes that support fast searching for similar
    strings.
   </para>
