diff --git a/gui-doc/scribblings/gui/dialog-funcs.scrbl b/gui-doc/scribblings/gui/dialog-funcs.scrbl
index f698e1f5..d0aa1f45 100644
--- a/gui-doc/scribblings/gui/dialog-funcs.scrbl
+++ b/gui-doc/scribblings/gui/dialog-funcs.scrbl
@@ -58,7 +58,9 @@ On Windows and Unix, @racket[filters] determines a set of filters from
  @racket[filters] list contains two strings: a description of the filter
  as seen by the user, and a filter pattern matched against file names.
  Pattern strings can be a simple ``glob'' pattern, or a number of glob
- patterns separated by a @litchar[";"] character.
+ patterns separated by a @litchar[";"] character. These patterns are not
+ regular expressions and can only be used with a @litchar["*"] wildcard
+ character.  For example, @racket["*.jp*g;*.png"].
  On Unix, a @racket["*.*"] pattern is implicitly replaced with @racket["*"].
  On Mac OS X, suffix names are extracted from all globs that match a
  fixed suffix (e.g., two suffixes of @racket["foo"] and @racket["bar"]
@@ -84,7 +86,7 @@ See also @racket[path-dialog%] for a richer interface.
          (or/c (listof path?) #f)]{
 Like
 @racket[get-file], except that the user can select multiple files, and the
- result is either a list of file paths of @racket[#f].
+ result is either a list of file paths or @racket[#f].
 
 }