diff --git a/ErsatzTV.Core/Probe698/PostFixMarker.cs b/ErsatzTV.Core/Probe698/PostFixMarker.cs
new file mode 100644
index 000000000..bc3e0985d
--- /dev/null
+++ b/ErsatzTV.Core/Probe698/PostFixMarker.cs
@@ -0,0 +1,3 @@
+// ersatztv#698 route-1 POST-FIX verification marker. Never merged.
+namespace ErsatzTV.Core.Probe698;
+internal static class PostFixMarker { internal const string N = "post-fix"; }
diff --git a/docs/probe698d-note.md b/docs/probe698d-note.md
new file mode 100644
index 000000000..1a1d783bb
--- /dev/null
+++ b/docs/probe698d-note.md
@@ -0,0 +1 @@
+post-fix route-1 verification