doc: Mention supported ITS data categories

diff --git a/gettext-tools/doc/gettext.texi b/gettext-tools/doc/gettext.texi
index 4bdf30d26ef6f65c3122d2d529c37b9378d2fff0..0d6e55798cd3a787db4e95cf510e46333c1cd852 100644 (file)
--- a/gettext-tools/doc/gettext.texi
+++ b/gettext-tools/doc/gettext.texi
@@ -12253,7 +12253,9 @@ appdata-tools, appstream, libappstream-glib, libappstream-glib-builder
 
 Marking translatable strings in an XML file is done with a separate
 "rule" file, making use of the Internationalization Tag Set standard
-(ITS, @uref{http://www.w3.org/TR/its20/}).
+(ITS, @uref{http://www.w3.org/TR/its20/}).  Currently supported ITS data
+categories are: @samp{Translate}, @samp{Localization Note},
+@samp{Elements Within Text}, and @samp{Preserve Space}.
 
 For example, given the following XML document: