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+# Issuable-like Rails models utilities
+
+GitLab Rails codebase contains several models that hold common functionality and behave similarly to an [Issue]. Other
+examples of `Issuable`s are [Merge Requests] and [Epics].
+
+This guide accumulates guidelines on working with such Rails models.
+
+## Important text fields
+
+There are max length constraints for the most important text fields for `Issuable`s:
+
+- `title`: 255 chars
+- `title_html`: 800 chars
+- `description`: 16000 chars
+- `description_html`: 48000 chars
+
+[Issue]: https://docs.gitlab.com/ee/user/project/issues
+[Merge Requests]: https://docs.gitlab.com/ee/user/project/merge_requests
+[Epics]: https://docs.gitlab.com/ee/user/group/epics