--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ DATA_built	= plr.sql
 DATA		= plr--8.3.0.17.sql plr--unpackaged--8.3.0.17.sql
 DOCS		= README.plr
 REGRESS		= plr
-EXTRA_CLEAN	= doc/html/* doc/plr-US.aux doc/plr-*.log doc/plr-*.out doc/plr-*.pdf doc/plr-*.tex-pdf doc/HTML.index
+EXTRA_CLEAN_MANUAL	= doc/html/* doc/plr-US.aux doc/plr-*.log doc/plr-*.out doc/plr-*.pdf doc/plr-*.tex-pdf doc/HTML.index
 
 ifdef USE_PGXS
 ifndef PG_CONFIG
@@ -93,3 +93,6 @@ all:
 	 echo ""
 
 endif
+
+clean_manual:
+	rm -f $(EXTRA_CLEAN_MANUAL)
