diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5ff11fbc4f19..b47eb53fed48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -493,7 +493,7 @@ jobs:
       - run: ./.github/downstream.d/${{ matrix.DOWNSTREAM }}.sh run
 
   docs-linkcheck:
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || (github.event_name == 'pull_request' && contains(github.event.pull_request.title, 'linkcheck'))
     runs-on: ubuntu-latest
     name: "linkcheck"
     timeout-minutes: 15
diff --git a/docs/conf.py b/docs/conf.py
index c8bab9afb8b5..07c428f1ebef 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -205,6 +205,8 @@
     r"https://e-trust.gosuslugi.ru",
     # Expired cert
     r"https://www.cosic.esat.kuleuven.be",
+    # Incomplete cert chain
+    r"https://www.oscca.gov.cn",
 ]
 
 autosectionlabel_prefix_document = True