diff --git a/overviewer.py b/overviewer.py
index c836db1..163a850 100755
--- a/overviewer.py
+++ b/overviewer.py
@@ -109,8 +109,8 @@ def main():
     parser.add_option("--forcerender", dest="forcerender", helptext="Force re-rendering the entire map (or the given regionlist). Useful for re-rendering without deleting it.", action="store_true")
     parser.add_option("--rendermodes", dest="rendermode", helptext="Specifies the render types, separated by ',', ':', or '/'. Use --list-rendermodes to list them all.", type="choice", required=True, default=avail_rendermodes[0], listify=True)
     parser.add_option("--list-rendermodes", dest="list_rendermodes", action="store_true", helptext="List available render modes and exit.", commandLineOnly=True)
-    parser.add_option("--rendermode-options", dest="rendermode_options", default={}, advanced=True)
-    parser.add_option("--custom-rendermodes", dest="custom_rendermodes", default={}, advanced=True)
+    parser.add_option("--rendermode-options", dest="rendermode_options", default={}, advanced=True, helptext="Used to specify options for different rendermodes.  Only useful in a settings.py file")
+    parser.add_option("--custom-rendermodes", dest="custom_rendermodes", default={}, advanced=True, helptext="Used to define custom rendermodes.  Only useful in a settings.py file")
     parser.add_option("--imgformat", dest="imgformat", helptext="The image output format to use. Currently supported: png(default), jpg.", advanced=True )
     parser.add_option("--imgquality", dest="imgquality", default=95, helptext="Specify the quality of image output when using imgformat=\"jpg\".", type="int", advanced=True)
     parser.add_option("--bg-color", dest="bg_color", helptext="Configures the background color for the GoogleMap output.  Specify in #RRGGBB format", advanced=True, type="string", default="#1A1A1A")