diff --git a/index.ipynb b/index.ipynb
index f2051d2..41b786e 100644
--- a/index.ipynb
+++ b/index.ipynb
@@ -42,7 +42,7 @@
     "\n",
     "1. [Stereophonic Recording Techniques](recording.ipynb)\n",
     "\n",
-    "1. Revision"
+    "1. Revision (no notebook available)"
    ]
   },
   {