diff --git a/orcestra_book/_toc.yml b/orcestra_book/_toc.yml
index f9c0cf6c..389a7da7 100644
--- a/orcestra_book/_toc.yml
+++ b/orcestra_book/_toc.yml
@@ -29,7 +29,7 @@ chapters:
     - file: operation/halo
     - file: operation/rvmeteor
     - file: operation/kingair
-    - file: operation/radiosonde
+    - file: operation/radiosondes
     - file: flightplan_docs
       title: Flight plan docs
 - file: data