update README

README.md

@@ -142,6 +142,11 @@ popd
 
 To add images, drop them into [this GCS bucket](https://console.cloud.google.com/storage/browser/ganymede-bio-website/public;tab=objects?project=ganymede-website-356920&pageState=(%22StorageObjectListTable%22:(%22f%22:%22%255B%255D%22))&prefix=&forceOnObjectsSortingFiltering=false)
 
+
+### Spellchecking
+
+To add new words to the allowed list, update `.wordlist.txt`.
+
 ---
 
 ## License