diff --git a/pull_request_template.md b/pull_request_template.md
index cc582eff..d3200f01 100644
--- a/pull_request_template.md
+++ b/pull_request_template.md
@@ -11,4 +11,5 @@
 
 - [ ] My change follows the [Contributing Guidelines](./CONTRIBUTING.md)
 - [ ] I have added only one new link to the list.
+- [ ] I have checked that the link that I added does NOT exist in the project already.
 - [ ] I have sorted the link alphabetically under the related section.