diff --git a/samples/custom/.env.es.example b/samples/custom/.env.es.example
index 3d79b4b6..2ce76ce4 100644
--- a/samples/custom/.env.es.example
+++ b/samples/custom/.env.es.example
@@ -145,7 +145,7 @@ CKANEXT__SPATIAL__SEARCH_BACKEND=solr-bbox
 CKAN__SPATIAL__SRID=3857
 CKANEXT__SPATIAL__COMMON_MAP__TYPE=custom
 CKANEXT__SPATIAL__COMMON_MAP__CUSTOM__URL=https://rts.larioja.org/mapa-base/rioja/{z}/{x}/{y}.png
-CKANEXT__SPATIAL__COMMON_MAP__ATTRIBUTION='<a href="https://www.scne.es/">SCNE</a>, bajo <a href="http://creativecommons.org/licenses/by/4.0>'
+CKANEXT__SPATIAL__COMMON_MAP__ATTRIBUTION='<a href="https://www.scne.es/">SCNE</a>, bajo <a href="http://creativecommons.org/licenses/by/4.0">CC BY 4.0</a>'
 
 # ckanext-geoview
 CKANEXT__GEOVIEW__GEOJSON__MAX_FILE_SIZE=100000000