Issue #17386: List the 'htmlview' target in the Doc/Makefile help output.
diff --git a/Doc/Makefile b/Doc/Makefile
index 12fc698..370c3fa 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -22,6 +22,7 @@
@echo "Please use \`make <target>' where <target> is one of"
@echo " clean to remove build files"
@echo " html to make standalone HTML files"
+ @echo " htmlview to open the index page built by the html target in your browser"
@echo " htmlhelp to make HTML files and a HTML help project"
@echo " latex to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
@echo " text to make plain text files"