diff --git a/tutorial/_toc.yml b/tutorial/_toc.yml
index 9de44de..6bd3982 100644
--- a/tutorial/_toc.yml
+++ b/tutorial/_toc.yml
@@ -53,7 +53,7 @@ parts:
   - file: part3/data_exploitability_pangeo
     title: How to exploit data on Pangeo
   - file: part3/advanced_udf
-    title: Custom algorithms: UDF (OpenEO) and ufunc (Xarray)
+    title: Custom algorithms - UDF (OpenEO) and ufunc (Xarray)
   - file: part3/scaling_openeo
     title: Scaling with OpenEO