diff --git a/README.md b/README.md
index fd63790..ca0b68c 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,8 @@ The current process of adding new codes involves being made aware of them face t
    - A pre-authorised key in the subject field, any emails not matching the key should be discarded.
  - Attachment formats may vary slightly.
    - The format of the attachment should be checked and any errors handled gracefully.
+ - Avoid duplicate issues
+   - Issues opened should contain the missing PIS code in their title, this application should check for any open issues containing the missing code to avoid duplicated issues.
 
 ## Main external dependencies (Expected)
  - imaplib