diff --git a/go/delivery/checker.go b/go/delivery/checker.go
index ffd0b66..edb24a8 100644
--- a/go/delivery/checker.go
+++ b/go/delivery/checker.go
@@ -147,6 +147,9 @@ type FailedFirst struct {
 	Step   string `json:"step,omitempty"`
 	Module string `json:"module,omitempty"`
 	Run    string `json:"run,omitempty"`
+	// Pull is the pull request whose check failed, <owner/repo>#<number>: a verdict outlives its candidate, and a reader
+	// finds a pull request's last failure by it.
+	Pull string `json:"pull,omitempty"`
 }
 
 // MaxFailures is the most entries a verdict's Failures holds (issue 1921): fifty tests named one by one, and an entry