diff --git a/routers/api/v1/repo/pull.go b/routers/api/v1/repo/pull.go
index 0a2ff03c7e..8456dcff59 100644
--- a/routers/api/v1/repo/pull.go
+++ b/routers/api/v1/repo/pull.go
@@ -47,7 +47,7 @@ import (
 func ListPullRequests(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/pulls repository repoListPullRequests
 	// ---
-	// summary: List a repo's pull requests
+	// summary: List a repo's pull requests. If a pull request is selected but fails to be retrieved for any reason, it will be a null value in the list of results.
 	// produces:
 	// - application/json
 	// parameters:
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index ff9f0f15b9..c2f8538c28 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -12767,7 +12767,7 @@
         "tags": [
           "repository"
         ],
-        "summary": "List a repo's pull requests",
+        "summary": "List a repo's pull requests. If a pull request is selected but fails to be retrieved for any reason, it will be a null value in the list of results.",
         "operationId": "repoListPullRequests",
         "parameters": [
           {