diff --git a/PULL_REQUEST_TEMPLATE.md b/PULL_REQUEST_TEMPLATE.md
index 3313f6c..b57de6f 100644
--- a/PULL_REQUEST_TEMPLATE.md
+++ b/PULL_REQUEST_TEMPLATE.md
@@ -3,6 +3,7 @@
 - [ ] I have read the [contribution guidelines](https://github.com/ooni/probe-cli/blob/master/CONTRIBUTING.md)
 - [ ] reference issue for this pull request: <!-- add URL here -->
 - [ ] if you changed anything related how experiments work and you need to reflect these changes in the ooni/spec repository, please link to the related ooni/spec pull request: <!-- add URL here -->
+- [ ] if you change code inside an experiment, make sure you bump its version number
 
 <!-- Reminder: Location of the issue tracker: https://github.com/ooni/probe -->