diff --git a/en/Obsidian Web Clipper/Filters.md b/en/Obsidian Web Clipper/Filters.md
index be8245658..f05b4bdf6 100644
--- a/en/Obsidian Web Clipper/Filters.md	
+++ b/en/Obsidian Web Clipper/Filters.md	
@@ -301,6 +301,8 @@ String literals are supported and automatically wrapped in an object with a `str
 
 Combine `map` with the `template` filter, e.g. `map:item => ({name: ${item.gem}, color: item.color})|template:"- ${name} is ${color}\n"`.
 
+Note: Built-in filters cannot be used inside `map`. This means that, for example, trimming each value of an array cannot be done with `map`.
+
 ### `merge`
 
 Adds new values to an array.
@@ -371,4 +373,4 @@ Removes duplicate values from arrays and objects.
 - For arrays of primitives: `[1,2,2,3,3]|unique` returns `[1,2,3]`.
 - For arrays of objects: `[{"a":1},{"b":2},{"a":1}]|unique` returns `[{"a":1},{"b":2}]`.
 - For objects it removes properties with duplicate values, keeping the last occurrence's key.
-- For strings it returns the input unchanged.
\ No newline at end of file
+- For strings it returns the input unchanged.