diff --git a/doc/nasmdoc.src b/doc/nasmdoc.src
index 4847a90f..9c2070a3 100644
--- a/doc/nasmdoc.src
+++ b/doc/nasmdoc.src
@@ -584,6 +584,7 @@ if \c{-F} is specified.
 A complete list of the available debug file formats for an output
 format can be seen by issuing the command \i\c{nasm -f <format>
 -y}. Not all output formats currently support debugging output.
+See \k{opt-y}.
 
 This should not be confused with the \c{-f dbg} output format option which 
 is not built into NASM by default. For information on how