diff --git a/modules/ROOT/pages/extending-neo4j/aggregation-functions.adoc b/modules/ROOT/pages/extending-neo4j/aggregation-functions.adoc
index c431189..518a6dd 100644
--- a/modules/ROOT/pages/extending-neo4j/aggregation-functions.adoc
+++ b/modules/ROOT/pages/extending-neo4j/aggregation-functions.adoc
@@ -32,6 +32,13 @@ An aggregator class contains one method annotated with `@UserAggregationUpdate`
 The method annotated with `@UserAggregationUpdate` will be called multiple times and enables the class to aggregate data.
 When the aggregation is done, the method annotated with `@UserAggregationResult` will be called once and the result of the aggregation will be returned.
 
+Particular things to note:
+
+* All functions are annotated with `@UserAggregationFunction`.
+* The aggregation function name must be namespaced and is not allowed in reserved namespaces.
+* If a user-defined aggregation function is registered with the same name as a built-in function in a deprecated namespace, the built-in function is shadowed.
+
+
 See xref:extending-neo4j/values-and-types.adoc[] for details on values and types.
 
 For more details, see the Neo4j Javadocs for link:{org-neo4j-procedure-UserAggregationFunction}[`org.neo4j.procedure.UserAggregationFunction`^].
@@ -132,3 +139,55 @@ public class LongestStringTest
 }
 ----
 
+[[reserved-and-deprecated-namespaces]]
+== Reserved and deprecated function namespaces
+
+[[reserved-and-deprecated-function-namespaces]]
+.Overview of reserved and deprecated function namespaces and names
+[options="header", cols="m,m"]
+|===
+| Reserved                      | Deprecated since Neo4j 2025.11
+| *                             | abac.*
+| date                          | aura.*
+| date.realtime                 | builtin.*
+| date.statement                | cdc.*
+| date.transaction              | coll.*
+| date.truncate                 | date.*
+| datetime                      | datetime.*
+| datetime.fromepoch            | db.*
+| datetime.fromepochmillis      | dbms.*
+| datetime.realtime             | duration.*
+| datetime.statement            | graph.*
+| datetime.transaction          | internal.*
+| datetime.truncate             | localdatetime.*
+| db.nameFromElementId          | localtime.*
+| duration                      | math.*
+| duration.between              | plugin.*
+| duration.inDays               | point.*
+| duration.inMonths             | stored.*
+| duration.inSeconds            | string.*
+| graph.byElementId             | time.*
+| graph.byName                  | tx.*
+| graph.names                   | unsupported.*
+| graph.propertiesByName        | vector.*
+| localdatetime                 |
+| localdatetime.realtime        |
+| localdatetime.statement       |
+| localdatetime.transaction     |
+| localdatetime.truncate        |
+| localtime                     |
+| localtime.realtime            |
+| localtime.statement           |
+| localtime.transaction         |
+| localtime.truncate            |
+| point.distance                |
+| point.withinBBox              |
+| time                          |
+| time.realtime                 |
+| time.statement                |
+| time.transaction              |
+| time.truncate                 |
+| vector.similarity.cosine      |
+| vector.similarity.euclidean   |
+|===
+
diff --git a/modules/ROOT/pages/extending-neo4j/functions.adoc b/modules/ROOT/pages/extending-neo4j/functions.adoc
index 147957f..4eb665c 100644
--- a/modules/ROOT/pages/extending-neo4j/functions.adoc
+++ b/modules/ROOT/pages/extending-neo4j/functions.adoc
@@ -30,6 +30,12 @@ RETURN org.neo4j.examples.join(collect(p.names))
 User-defined functions are created similarly to how procedures are created.
 But unlike procedures, they are annotated with `@UserFunction` and return a single value instead of a stream of values.
 
+Particular things to note:
+
+* All functions are annotated with `@UserFunction`.
+* The function name must be namespaced and is not allowed in reserved namespaces.
+* If a function is registered with the same name as a built-in function in a deprecated namespace, the built-in function is shadowed.
+
 See xref:extending-neo4j/values-and-types.adoc[] for details on values and types.
 
 For more details, see the link:{org-neo4j-procedure-UserFunction}[Neo4j Javadocs for `org.neo4j.procedure.UserFunction`^].
@@ -120,3 +126,54 @@ public class JoinTest {
 }
 ----
 
+[[reserved-and-deprecated-namespaces]]
+== Reserved and deprecated function namespaces
+
+[[reserved-and-deprecated-function-namespaces]]
+.Overview of reserved and deprecated function namespaces and names
+[options="header", cols="m,m"]
+|===
+| Reserved                      | Deprecated since Neo4j 2025.11
+| *                             | abac.*
+| date                          | aura.*
+| date.realtime                 | builtin.*
+| date.statement                | cdc.*
+| date.transaction              | coll.*
+| date.truncate                 | date.*
+| datetime                      | datetime.*
+| datetime.fromepoch            | db.*
+| datetime.fromepochmillis      | dbms.*
+| datetime.realtime             | duration.*
+| datetime.statement            | graph.*
+| datetime.transaction          | internal.*
+| datetime.truncate             | localdatetime.*
+| db.nameFromElementId          | localtime.*
+| duration                      | math.*
+| duration.between              | plugin.*
+| duration.inDays               | point.*
+| duration.inMonths             | stored.*
+| duration.inSeconds            | string.*
+| graph.byElementId             | time.*
+| graph.byName                  | tx.*
+| graph.names                   | unsupported.*
+| graph.propertiesByName        | vector.*
+| localdatetime                 |
+| localdatetime.realtime        |
+| localdatetime.statement       |
+| localdatetime.transaction     |
+| localdatetime.truncate        |
+| localtime                     |
+| localtime.realtime            |
+| localtime.statement           |
+| localtime.transaction         |
+| localtime.truncate            |
+| point.distance                |
+| point.withinBBox              |
+| time                          |
+| time.realtime                 |
+| time.statement                |
+| time.transaction              |
+| time.truncate                 |
+| vector.similarity.cosine      |
+| vector.similarity.euclidean   |
+|===
\ No newline at end of file
diff --git a/modules/ROOT/pages/extending-neo4j/procedures.adoc b/modules/ROOT/pages/extending-neo4j/procedures.adoc
index 2d61214..908d15f 100644
--- a/modules/ROOT/pages/extending-neo4j/procedures.adoc
+++ b/modules/ROOT/pages/extending-neo4j/procedures.adoc
@@ -143,6 +143,8 @@ Particular things to note:
 * The procedure annotation can take three optional arguments: `name`, `mode`, and `eager`.
 ** `name` is used to specify a different name for the procedure than the default generated, which is `class.path.nameOfMethod`.
    If `mode` is specified, `name` must be specified as well.
+** `name` is not allowed in a reserved namespace, and having a `name` without a namespace is deprecated behavior.
+** If a procedure is registered with the same name as a built-in procedure in a deprecated namespace, the built-in procedure is shadowed.
 ** `mode` is used to declare the types of interactions that the procedure performs.
    A procedure fails if it attempts to execute database operations that violate its mode.
    The default `mode` is `READ`.
@@ -163,7 +165,7 @@ Particular things to note:
 MATCH (n)
 WHERE n.key = 'value'
 WITH n
-CALL deleteNeighbours(n, 'FOLLOWS')
+CALL example.deleteNeighbours(n, 'FOLLOWS')
 ----
 This query can delete some of the nodes that are matched by the Cypher query, and the `n.key` lookup will fail.
 Marking this procedure as `eager` prevents this from causing an error in Cypher code.
@@ -273,3 +275,26 @@ public class MyProcedures {
 }
 
 ----
+
+[[reserved-and-deprecated-namespaces]]
+== Reserved and deprecated procedure namespaces
+
+[[reserved-and-deprecated-procedure-namespaces]]
+.Overview of reserved and deprecated procedure namespaces
+[options="header", cols="m,m"]
+|===
+| Reserved          | Deprecated since Neo4j 2025.11
+| cdc.*             | *
+| date.*            | abac.*
+| datetime.*        | aura.*
+| db.*              | builtin.*
+| dbms.*            | coll.*
+| duration.*        | math.*
+| graph.*           | plugin.*
+| internal.*        | point.*
+| localdatetime.*   | stored.*
+| localtime.*       | string.*
+| time.*            | vector.*
+| tx.*              |
+| unsupported.*     |
+|===