diff --git a/Logic/ExtraFunction.ts b/Logic/ExtraFunction.ts
index 51f4ff9f93..a8b5aca339 100644
--- a/Logic/ExtraFunction.ts
+++ b/Logic/ExtraFunction.ts
@@ -23,13 +23,13 @@ Before proceeding, some warnings:
In the layer object, add a field calculatedTags, e.g.:
-
+\`\`\`
"calculatedTags": [
"_someKey=javascript-expression",
"name=feat.properties.name ?? feat.properties.ref ?? feat.properties.operator",
"_distanceCloserThen3Km=feat.distanceTo( some_lon, some_lat) < 3 ? 'yes' : 'no'"
]
-
+\`\`\`
The above code will be executed for every feature in the layer. The feature is accessible as feat and is an amended geojson object:
- area contains the surface area (in square meters) of the object