diff --git a/makedist.sh b/makedist.sh
index 0bd1fdf..f858dea 100755
--- a/makedist.sh
+++ b/makedist.sh
@@ -8,8 +8,12 @@ mkdir tmp.$$/puzzles
 # Build Windows Help and text versions of the manual for convenience.
 halibut --winhelp=puzzles.hlp --text=puzzles.txt puzzles.but
 
-for i in *.c *.h *.but LICENCE README Recipe mkfiles.pl Makefile.* \
-  puzzles.txt puzzles.hlp puzzles.cnt; do
+# Build a text version of the HACKING document.
+halibut --text=HACKING HACKING.but
+
+for i in *.c *.m *.h *.but *.plist *.icns LICENCE README Recipe \
+  mkfiles.pl Makefile Makefile.* \
+  HACKING puzzles.txt puzzles.hlp puzzles.cnt; do
   ln -s ../../$i tmp.$$/puzzles
 done