diff --git a/util/LLgen/Makefile b/util/LLgen/Makefile
index 8833dbbd2..e3f39deed 100644
--- a/util/LLgen/Makefile
+++ b/util/LLgen/Makefile
@@ -29,6 +29,7 @@ DOCS = \
 OBJS = $(patsubst %.c, $(OBJDIR)/%.o, $(SRCS))
 DEPS = $(patsubst %.c, $(OBJDIR)/%.d, $(SRCS))
 PDFS = $(patsubst doc/%.n, $(OBJDIR)/%.pdf, $(DOCS))
+HTMLS = $(patsubst doc/%.n, $(OBJDIR)/%/index.html, $(DOCS))
 
 all: LLgen doc
 
@@ -41,14 +42,18 @@ $(OBJDIR)/%.o: %.c
 
 $(OBJDIR)/%.pdf: doc/%.n doc/LLgen.refs
 	@mkdir -p $(dir $@)
-	groff -R -G -e -g -p -ms -Tpdf $< > $@
+	refer $< | groff -G -e -g -p -ms -Tpdf $< > $@
 
-doc:: $(PDFS)
+$(OBJDIR)/%/index.html: doc/%.n doc/LLgen.refs
+	@mkdir -p $(dir $@)
+	refer $< | (cd $(dir $@) && groff -I$(PWD) -G -e -g -p -ms -Thtml) > $@
+
+doc:: $(PDFS) $(HTMLS)
 
 clean:
 	rm -rf $(OBJDIR)
 
-install: LLgen doc/LLgen.1 $(PDFS) $(wildcard lib/*)
+install: LLgen doc/LLgen.1 $(PDFS) $(HTMLS) $(wildcard lib/*)
 	install -D -s LLgen                    -t $(PREFIX)/bin
 	install -D    doc/LLgen.1              -t $(PREFIX)/man/man1
 	install -D    $(OBJDIR)/LLgen.pdf      -t $(PREFIX)/doc/LLgen