diff --git a/doc/index.md b/doc/index.md
index 39a3771..2d3ebe0 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -17,4 +17,5 @@
 
 * Server Replies, documented
    * Errors
+      * [401 - No such nick/channel](nosuchnick.md)
       * [421 - Unknown command](notfound.md)
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