diff --git a/README.rst b/README.rst
index 08e3c87..1cb1865 100644
--- a/README.rst
+++ b/README.rst
@@ -86,7 +86,8 @@ Usage
     optional arguments:
       -h, --help            show this help message and exit
       --bytes               Display values in bytes instead of bits. Does not
-                            affect the image generated by --share
+                            affect the image generated by --share, nor output from
+                            --json or --csv
       --share               Generate and provide a URL to the speedtest.net share
                             results image
       --simple              Suppress verbose output, only show basic information