Update instructions

supporting-docs/projects/README.md

@@ -3,4 +3,4 @@ We are using [jekyll](https://jekyllrb.com/) to generate the [try matrix now](ht
 
 Feel free to send us a PR to add or update a project entry. You can start with the [template](./template.md), and you can upload a thumbnail and/or a main picture to the [images](./images/) subfolder - these will be accessible from https://matrix.org/docs/projects/images/
 
-Jekyll requires a date in the project filename; we use the date to sort the various project lists (newest projects first). It might be best to submit new entries with a date like 2015-01-01.
+Jekyll requires a date in the project filename; we use the date to sort the various project lists (oldest projects first). Please submit new entries with the starting date of the project.