From 4d8ec536f3c640ea4a178166338edbebb5126c8b Mon Sep 17 00:00:00 2001
From: Louise Berglund <louise.berglund@neo4j.com>
Date: Fri, 16 Jan 2026 15:15:45 +0100
Subject: [PATCH] Add documentation for size() of vector values.

This seems to have been overlooked when the new vector functions were added.
---
 modules/ROOT/pages/functions/scalar.adoc | 30 ++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/modules/ROOT/pages/functions/scalar.adoc b/modules/ROOT/pages/functions/scalar.adoc
index 9f486d832..8c0a78168 100644
--- a/modules/ROOT/pages/functions/scalar.adoc
+++ b/modules/ROOT/pages/functions/scalar.adoc
@@ -709,9 +709,9 @@ A randomly-generated UUID is returned.
 .Details
 |===
 | *Syntax* 3+| `size(input)`
-| *Description* 3+| Returns the number of items in a `LIST<ANY>` or the number of Unicode characters in a `STRING`.
+| *Description* 3+| Returns the number of items in a `LIST<ANY>`, the number of Unicode characters in a `STRING` or the dimension of a `VECTOR`.
 .2+| *Arguments* | *Name* | *Type* | *Description*
-| `input` | `STRING \| LIST<ANY>` | A value whose length is to be calculated.
+| `input` | `STRING \| LIST<ANY> \| VECTOR` | A value whose length is to be calculated.
 | *Returns* 3+| `INTEGER`
 |===
 
@@ -802,6 +802,32 @@ The number of characters in the `STRING` `'Charlie'` is returned.
 
 ======
 
+.+size()+ applied to vectors
+======
+
+.Query
+[source, cypher]
+----
+RETURN size(vector([1, 2, 3], 3, INTEGER8)) AS size
+----
+
+.Result
+[role="queryresult",options="header,footer",cols="1*<m"]
+|===
+
+| size
+| 3
+1+d|Rows: 1
+
+|===
+
+The dimension of the vector is returned.
+
+======
+
+[TIP]
+You can also use the xref:functions/vector.adoc#functions-vector_dimension_count[`vector_dimension_count()`] function to return the dimension of a `VECTOR` value.
+
 
 [[functions-startnode]]
 == startNode()