diff --git a/Documentation/Books/Users/IndexHandling/IndexBasics.mdpp b/Documentation/Books/Users/IndexHandling/IndexBasics.mdpp
index 6ad0b20689..bb23733d1e 100644
--- a/Documentation/Books/Users/IndexHandling/IndexBasics.mdpp
+++ b/Documentation/Books/Users/IndexHandling/IndexBasics.mdpp
@@ -269,7 +269,8 @@ way.
 To make an index insert the individual array members into the index instead of the entire array
 value, a special array index needs to be created for the attribute. Array indexes can be set up 
 like regular hash or skiplist indexes using the `collection.ensureIndex()` function. To make a 
-hash or skiplist index an array index, the index attribute name needs to be extended with <i>[\*]</i>.
+hash or skiplist index an array index, the index attribute name needs to be extended with <i>[\*]</i>
+when creating the index and when filtering in an AQL query using the `IN` operator.
 
 The following example creates an array hash index on the `tags` attribute in a collection named
 `posts`:
@@ -369,3 +370,8 @@ db.posts.insert({tags: [1, 2, 3], name: "alice"})
 db.posts.insert({tags: [null], name: "bob"})
 // Will be indexed for [null, "bob"] 
 ```
+
+Please note that filtering using array indexes only works from within AQL queries and
+only if the query filters on the indexed attribute using the `IN` operator. The other
+comparison operators (`==`, `!=`, `>`, `>=`, `<`, `<=`) currently cannot use array
+indexes.