* doc/groff.texinfo (Headers and footers): Document PT, HD, and BT.

1 files changed, 14 insertions, 0 deletions

diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index 6b47fec3..68f3a028 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -3992,6 +3992,20 @@ You can replace the quote (@code{'}) marks with any character not
 appearing in the header or footer text.
 @endDefmac
 
+To specify custom header and footer processing,
+redefine the following macros:
+
+@DefmacList {PT,, ms}
+@DefmacItem {HD,, ms}
+@DefmacListEnd {BT,, ms}
+The @code{PT} macro defines a custom header;
+the @code{BT} macro defines a custom footer.  These macros must
+handle odd/even/first page differences if necessary.
+
+The @code{HD} macro defines additional header processing 
+to take place after executing the @code{PT} macro.
+@endDefmac
+
 @c ---------------------------------------------------------------------
 
 @node ms Margins, ms Multiple Columns, ms Headers and Footers, ms Page Layout