diff --git a/13-looking-up-data.md b/13-looking-up-data.md
index 66464afa..493fdedd 100644
--- a/13-looking-up-data.md
+++ b/13-looking-up-data.md
@@ -182,7 +182,7 @@ The VIB-Bits extension adds a number of very useful functions to OpenRefine. One
 
 The functionality in OpenRefine can be enhanced by ‘extensions' which can be downloaded and installed to add functionality to your OpenRefine installation.
 
-A list of Extensions (not necessarily complete) is given on the OpenRefine downloads page at [http://openrefine.org/download.html](https://openrefine.org/download.html).
+A list of Extensions (not necessarily complete) is given on the OpenRefine Extensions page at [http://openrefine.org/extensions](https://openrefine.org/extensions).
 
 
 ::::::::::::::::::::::::::::::::::::::::::::::::::
diff --git a/md5sum.txt b/md5sum.txt
index 268064df..584baf74 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -15,7 +15,7 @@
 "episodes/10-data-transformation.md" "47399b9f87a7c2dfae1d6b67eea71cc7" "site/built/10-data-transformation.md" "2023-05-26"
 "episodes/11-using-arrays-transformations.md" "e115138dcb3c916bcaf5634600e594c4" "site/built/11-using-arrays-transformations.md" "2024-01-09"
 "episodes/12-export-transformation.md" "aa6dd576a893a0870baa24611573e50b" "site/built/12-export-transformation.md" "2023-05-01"
-"episodes/13-looking-up-data.md" "4be5191800691af09ff34b5fdd4c05bd" "site/built/13-looking-up-data.md" "2023-11-22"
+"episodes/13-looking-up-data.md" "4836a684fdebc498516367130e729746" "site/built/13-looking-up-data.md" "2024-05-08"
 "instructors/instructor-notes.md" "c2dfd88f1e85cccb9cbe872530c534ac" "site/built/instructor-notes.md" "2023-11-21"
 "learners/discuss.md" "60c724559d15d89fc50c5418d87f9628" "site/built/discuss.md" "2023-10-20"
 "learners/reference.md" "be4b8a891809c85a625fff879855921a" "site/built/reference.md" "2023-05-01"