diff --git a/docs/examples/fmi_ls_ref_manifest_example.xml b/docs/examples/fmi_ls_ref_manifest_example.xml
index db292e8..e11fcfc 100644
--- a/docs/examples/fmi_ls_ref_manifest_example.xml
+++ b/docs/examples/fmi_ls_ref_manifest_example.xml
@@ -7,7 +7,13 @@
 	fmi-ls:fmi-ls-version="1.0.0-alpha.1"
 	fmi-ls:fmi-ls-description="Layered Standard providing information on related files included in an FMU.">
 	
-	<Related type="text/modelica" source="modelica/mymodel.mo" role="model" description="Modelica Model Source"/>
+	<Related type="text/modelica" source="modelica/mymodel.mo" role="model" description="Modelica Model Source">
+		<Annotations>
+			<Annotation type="com.example.tool">
+				<tool:metadata xmlns:tool="com.example.tool" reviewedBy="alice"/>
+			</Annotation>
+		</Annotations>
+	</Related>
 	<Related type="application/x-ssp-parameter-set" source="baseline-params.ssv" role="parameter" description="Baseline Model Parameters"/>
 	<Related type="application/x-ssp-parameter-set" source="midend-params.ssv" role="parameter" description="Midend Model Parameters"/>
 	<Related type="application/x-ssp-parameter-set" source="highend-params.ssv" role="parameter" description="Highend Model Parameters"/>
diff --git a/docs/index.adoc b/docs/index.adoc
index b1566d9..5e8d50d 100644
--- a/docs/index.adoc
+++ b/docs/index.adoc
@@ -103,6 +103,9 @@ Beside these attributes the root element `fmiReferences` contains the following
 
 |`<Related>`
 |Each element describes one additional related file present in the FMU archive.
+
+|`<Annotations>`
+|Optional annotations as defined in the FMI standard.
 |====
 
 An example of a manifest file for this layered standard is shown below:
@@ -148,6 +151,18 @@ No base requirements on supported URI schemes are given in this layered standard
 |Brief description of the related file that is suitable for display to users.
 |====
 
+The `<Related>` element contains the following elements:
+
+.`<Related>` element details.
+[[table-schema-fmi-ls-ref-related-elements]]
+[cols="1,3"]
+|====
+|Element |Description
+
+|`<Annotations>`
+|Optional annotations as defined in the FMI standard.
+|====
+
 The `role` attribute is used to indicate the purpose of the related file.
 A role can consist of a main role and optionally one or more sub-roles, separated by a forward slash (`/`), that indicate more specific purposes of the related file.
 For example, the role `experiment/smoke-test` indicates that the related file is an experiment file that can be used to perform a smoke test validation of the FMU, while the role `experiment/validation` indicates that the related file is an experiment file that can be used to perform a detailed validation of the FMU.
@@ -315,6 +330,9 @@ Beside these attributes the root element `<Experiments>` contains the following
 
 |`<Experiment>`
 |Each element describes one experiment setup.
+
+|`<Annotations>`
+|Optional annotations as defined in the FMI standard.
 |====
 
 An example of an experiments file for this layered standard is shown below:
@@ -369,5 +387,8 @@ The `<Experiment>` element contains the following elements:
 
 |`<References>`
 |Reference results for the experiment setup.
+
+|`<Annotations>`
+|Optional annotations as defined in the FMI standard.
 |====
 
diff --git a/schema/fmi3LayeredStandardReferenceExperiments.xsd b/schema/fmi3LayeredStandardReferenceExperiments.xsd
index 1df1d35..ba078e9 100644
--- a/schema/fmi3LayeredStandardReferenceExperiments.xsd
+++ b/schema/fmi3LayeredStandardReferenceExperiments.xsd
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified">
+    <xs:import schemaLocation="https://raw.githubusercontent.com/modelica/fmi-standard/main/schema/fmi3Annotation.xsd"/>
     <xs:annotation>
         <xs:documentation>
 Copyright(c) 2023-2025 Modelica Association Project "FMI".
@@ -42,6 +43,7 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                             <xs:element name="Parameters" minOccurs="0" type="TParameters"/>
                             <xs:element name="Stimuli" minOccurs="0" type="TTimeSeriesData"/>
                             <xs:element name="References" minOccurs="0" type="TTimeSeriesData"/>
+                            <xs:element ref="Annotations" minOccurs="0"/>
                         </xs:sequence>
                         <xs:attribute name="name" type="xs:string" use="required"/>
                         <xs:attribute name="description" type="xs:string"/>
@@ -51,6 +53,7 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                         <xs:attribute name="stepSize" type="xs:double"/>
                     </xs:complexType>
                 </xs:element>
+                <xs:element ref="Annotations" minOccurs="0"/>
             </xs:sequence>
             <xs:attribute name="name" type="xs:string" use="required"/>
             <xs:attribute name="description" type="xs:string"/>
@@ -58,6 +61,9 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     </xs:element>
         
     <xs:complexType name="TParameters">
+        <xs:sequence>
+            <xs:element ref="Annotations" minOccurs="0"/>
+        </xs:sequence>
         <xs:attribute name="type" type="xs:string" use="optional" default="application/x-ssp-parameter-set">
             <xs:annotation>
                 <xs:documentation xml:lang="en">
@@ -80,6 +86,9 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     </xs:complexType>
 
     <xs:complexType name="TTimeSeriesData">
+        <xs:sequence>
+            <xs:element ref="Annotations" minOccurs="0"/>
+        </xs:sequence>
         <xs:attribute name="type" type="xs:string" use="optional" default="text/csv">
             <xs:annotation>
                 <xs:documentation xml:lang="en">
diff --git a/schema/fmi3LayeredStandardReferenceManifest.xsd b/schema/fmi3LayeredStandardReferenceManifest.xsd
index ee81e6f..c9fbcaf 100644
--- a/schema/fmi3LayeredStandardReferenceManifest.xsd
+++ b/schema/fmi3LayeredStandardReferenceManifest.xsd
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fmi-ls="http://fmi-standard.org/fmi-ls-manifest" elementFormDefault="qualified" attributeFormDefault="qualified">
     <xs:import namespace="http://fmi-standard.org/fmi-ls-manifest" schemaLocation="https://raw.githubusercontent.com/modelica/fmi-standard/main/schema/fmi3LayeredStandardManifest.xsd"/>
+    <xs:import schemaLocation="https://raw.githubusercontent.com/modelica/fmi-standard/main/schema/fmi3Annotation.xsd"/>
     <xs:annotation>
         <xs:documentation>
 Copyright(c) 2023-2025 Modelica Association Project "FMI".
@@ -38,6 +39,7 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
         <xs:complexType>
             <xs:sequence>
                 <xs:element name="Related" minOccurs="0" maxOccurs="unbounded" type="TRelated"/>
+                <xs:element ref="Annotations" minOccurs="0"/>
             </xs:sequence>
             <xs:attribute ref="fmi-ls:fmi-ls-name" use="required" fixed="org.fmi-standard.fmi-ls-ref"/>
             <xs:attribute ref="fmi-ls:fmi-ls-version" use="required"/>
@@ -46,6 +48,9 @@ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     </xs:element>
     
     <xs:complexType name="TRelated">
+        <xs:sequence>
+            <xs:element ref="Annotations" minOccurs="0"/>
+        </xs:sequence>
         <xs:attribute name="type" type="xs:string" use="optional" default="application/octet-stream">
             <xs:annotation>
                 <xs:documentation xml:lang="en">