diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1b6172a7..79cce219 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,6 +24,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # Omitting 16.x for the time being, as Node's test-runner API doesn't
+        # support mocking until 18.x
         node-version: [16.x, 18.x, 20.x]
     steps:
       - uses: actions/checkout@v4