Fix help string in install.mk.

diff --git a/install.mk b/install.mk
index f9e6a8e..ac2b335 100755 (executable)
--- a/install.mk
+++ b/install.mk
@@ -10,7 +10,7 @@ SRC += exemple.cpp exemple.pro
 .PHONY: help generate install install_www
 
 help:
-       @echo "Usage: ./INSTALL generate | install | install_www"
+       @echo "Usage: $(MAKEFILE_LIST) generate | install | install_www"
 
 generate:
        rm -fr html/