Update index.md

Added a bit more on applying for access, and shifted the Open OnDemand acknowledgement to a formal one including their publication.

Signed-off-by: Nick Jones <n.jones@auckland.ac.nz>

docs/Scientific_Computing/Interactive_computing_with_NeSI_OnDemand/index.md

@@ -7,10 +7,13 @@
 
 ## Overview
 
-NeSI OnDemand is powered by [Open OnDemand](https://openondemand.org/) and provides web-based, interactive access to NeSI's cluster.
+NeSI OnDemand empowers students, researchers, and industry professionals with remote and interactive web access to NeSI.
 
 ## Connecting to NeSI OnDemand
 
+!!! prerequisite
+     Requires access to NeSI, [apply](https://www.nesi.org.nz/researchers/apply-access-our-services) before proceeding.
+
 Connect to NeSI OnDemand: [https://ondemand.nesi.org.nz](https://ondemand.nesi.org.nz/).
 
 For more information see the [How-to guide](how_to_guide.md).
@@ -28,4 +31,10 @@ A number of interactive applications can be accessed through NeSI OnDemand, incl
 ## Release notes
 
 Release notes can be found [here](Release_Notes/index.md) and the main differences
-compared to our Jupyter on NeSI service are described [here](changes_from_jupyter_on_nesi.md).
+compared to the current Jupyter on NeSI service are described [here](changes_from_jupyter_on_nesi.md).
+
+## Acknowledgements
+
+NeSI acknowledges the work of the Open OnDemand team in providing the underlying platform used for this service, as described in the following paper:
+
+[Hudak et al., (2018). Open OnDemand: A web-based client portal for HPC centers. Journal of Open Source Software, 3(25), 622, https://doi.org/10.21105/joss.00622](https://doi.org/10.21105/joss.00622)