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+Before submitting a pull request, please check the following.
+
+---
+When updating an **existing** appliance:
+- [ ] The new version is on top.
+- [ ] The filesnames in the "images" section are unique, to avoid appliances / version overwrinting each other.
+- [ ] If you forked the repo, running check.py doesn't drop any errors for the updated file.
+---
+When creating a **new** appliance:
+- It's tested locally, i.e.
+  - [ ] You dragged an instance into a project on your box, got it installed (if necessary), and did some basic network checks (ping, UI reachable, etc.).
+  - [ ] GNS3 VM can run it without any tweaks.
+  - [ ] You filled in as much info as possible (checks the schemas and other appliance files for some guidance).
+- [ ] When adding a container: it builds on Docker Hub and can be pulled.
+- [ ] The filesnames in the "images" section are unique (to avoid appliances and/or versions overwriting each other).
+- [ ] If you forked the repo, running check.py doesn't drop any errors for the new file.
+- [ ] *Optional: a symbol has been created for the new appliance.*