Add more info

README.md

@@ -105,7 +105,8 @@ Data generated by <a href="https://navigator.eumetsat.int/product/EO:EUM:DAT:MSG
 
 ### Other Known Limitations
 
-[Needs More Information]
+This dataset only includes the High Resolution Visible channel, and covers only the area around the UK. Additionally, the RSS service is shut down for 1 month each year, and so data for most of
+February 2020 and 2021 does not exist.
 
 ## Additional Information
 
@@ -119,4 +120,4 @@ Data generated by <a href="https://navigator.eumetsat.int/product/EO:EUM:DAT:MSG
 
 ### Citation Information
 
-[Needs More Information]
+Cite EUMETSAT as the data source.