updates to webpages

README.md

@@ -13,12 +13,13 @@ simulator.
 pyNRC works for a vareity NIRCam observing modes including direct imaging, 
 coronagraphic imaging, slitless grism spectroscopy, ~~DHS observations~~ (TBI), 
 and weak lens imaging.
-All PSFs are generated via WebbPSF (https://pythonhosted.org/webbpsf/) to reproduce 
+All PSFs are generated via WebbPSF (https://webbpsf.readthedocs.io/en/stable/) to reproduce 
 realistic JWST images and spectra.
 
 **Note**: pyNRC allows for more modes than are officially allowed by the Observatory,
 (ie., filter + coronagraphic combinations, subarray sizes, etc.). 
 Just because you can do something with pyNRC does not mean it will be supported.
+Check out https://jwst-docs.stsci.edu/display/JTI/NIRCam+Observing+Modes for more information.
 
 ## Installation