diff --git a/README.md b/README.md
index f5947b5..a3dc016 100644
--- a/README.md
+++ b/README.md
@@ -26,11 +26,11 @@ Usage: docbuilder [OPTION]... [INFILE] [OUTFILE]
 Converts Markdown files to pdf.
 Options:
   -c, --css=FILE   provide css file for styling (overrides default styling)
-  -p, --printhtml  output intermediate html file
+  -p, --printhtml  output intermediate html file (accepts optional filename argument)
   -h, --help       display this help and exit
   -v, --version    output version number and exit
 ```
 
 ## Build Phar
 
-A standalone .phar archive can be built with [box](http://box-project.org/ "Box Project").
\ No newline at end of file
+A standalone .phar archive can be built with [box](http://box-project.org/ "Box Project").