diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index 91f6d89bb19f..bab296c5f565 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -227,6 +227,10 @@ dochelp:
 	@echo  '  mandocs         - man pages'
 	@echo  '  installmandocs  - install man pages generated by mandocs'
 	@echo  '  cleandocs       - clean all generated DocBook files'
+	@echo
+	@echo  'make DOCBOOKS="s1.xml s2.xml" [target] Generate only docs s1.xml s2.xml'
+	@echo  '  valid values for DOCBOOKS are: $(DOCBOOKS)'
+
 
 ###
 # Temporary files left by various tools