diff --git a/contrib/mom/Makefile.sub b/contrib/mom/Makefile.sub
index 04fc501..6afc2c1 100644
--- a/contrib/mom/Makefile.sub
+++ b/contrib/mom/Makefile.sub
@@ -139,6 +139,7 @@ install_data: install_always \
 
 install_always: stamp-strip $(NORMALFILES)
 	-test -d $(DESTDIR)$(tmacdir) || $(mkinstalldirs) $(DESTDIR)$(tmacdir)
+	-test -d $(DESTDIR)$(htmldocdir)/mom || $(mkinstalldirs) $(DESTDIR)$(htmldocdir)/mom
 	for f in $(NORMALFILES); do \
 	  $(RM) $(DESTDIR)$(tmacdir)/$$f; \
 	  $(INSTALL_DATA) $(srcdir)/$$f $(DESTDIR)$(tmacdir)/$$f; \
@@ -147,6 +148,11 @@ install_always: stamp-strip $(NORMALFILES)
 	  $(RM) $(DESTDIR)$(tmacdir)/$$f; \
 	  $(INSTALL_DATA) $$f-s $(DESTDIR)$(tmacdir)/$$f; \
 	done
+	for f in $(HTMLDOCFILES); do \
+	  $(RM) $(DESTDIR)$(htmldocdir)/mom/$$f; \
+	  cp $$f \
+			$(DESTDIR)$(htmldocdir)/mom/; \
+	done
 
 install_pdfdoc:
 # Since this uses examples/, it's in install_pdfexamples
@@ -199,7 +205,12 @@ uninstall_always:
 	-for f in $(NORMALFILES) $(STRIPFILES); do \
 	  $(RM) $(DESTDIR)$(tmacdir)/$$f; \
 	done
-
+	-for f in $(HTMLDOCFILES_); do \
+	  $(RM) $(DESTDIR)$(htmldocdir)/mom/$$f; \
+	done
+	-test -d $(DESTDIR)$(htmldocdir)/mom && \
+	  rmdir $(DESTDIR)$(htmldocdir)/mom
+	
 uninstall_pdfdoc: uninstall_always
 # Since that used examples/, it's in uninstall_pdfexamples