diff --git a/pyqtgraph/__init__.py b/pyqtgraph/__init__.py
index 2edf928e..9aafa5b5 100644
--- a/pyqtgraph/__init__.py
+++ b/pyqtgraph/__init__.py
@@ -49,6 +49,7 @@ else:
 CONFIG_OPTIONS = {
     'useOpenGL': useOpenGL, ## by default, this is platform-dependent (see widgets/GraphicsView). Set to True or False to explicitly enable/disable opengl.
     'leftButtonPan': True,  ## if false, left button drags a rubber band for zooming in viewbox
+    # foreground/background take any arguments to the 'mkColor' in /pyqtgraph/functions.py
     'foreground': 'd',  ## default foreground color for axes, labels, etc.
     'background': 'k',        ## default background for GraphicsWidget
     'antialias': False,