diff --git a/.github/workflows/unit-tests-gh-hosted.yml b/.github/workflows/unit-tests-gh-hosted.yml
index fc5f9bee6371..80a6a4e53a08 100644
--- a/.github/workflows/unit-tests-gh-hosted.yml
+++ b/.github/workflows/unit-tests-gh-hosted.yml
@@ -17,23 +17,24 @@ jobs:
         python-version: [ '3.8' ]
         django-version:
           - "pinned"
-        shard_name: [
-            "lms-1",
-            "lms-2",
-            "lms-3",
-            "lms-4",
-            "lms-5",
-            "lms-6",
-            "openedx-1",
-            "openedx-2",
-            "openedx-3",
-            "openedx-4",
-            "cms-1",
-            "cms-2",
-            "common-1",
-            "common-2",
-            "common-3",
-        ]
+        # When updating the shards, remember to make the same changes in
+        # .github/workflows/unit-tests.yml
+        shard_name:
+          - "lms-1"
+          - "lms-2"
+          - "lms-3"
+          - "lms-4"
+          - "lms-5"
+          - "lms-6"
+          - "openedx-1"
+          - "openedx-2"
+          - "openedx-3"
+          - "openedx-4"
+          - "cms-1"
+          - "cms-2"
+          - "common-1"
+          - "common-2"
+          - "xmodule-1"
     name: gh-hosted-python-${{ matrix.python-version }},django-${{ matrix.django-version }},${{ matrix.shard_name }}
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 69a03bbeafff..43ac221e4680 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -18,6 +18,8 @@ jobs:
         django-version:
           - "pinned"
           #- "4.0"
+        # When updating the shards, remember to make the same changes in
+        # .github/workflows/unit-tests-gh-hosted.yml
         shard_name:
           - "lms-1"
           - "lms-2"