diff --git a/documentation/IDTA-01004/modules/ROOT/pages/bibliography.adoc b/documentation/IDTA-01004/modules/ROOT/pages/bibliography.adoc
index e70bb18..5e4f5f5 100644
--- a/documentation/IDTA-01004/modules/ROOT/pages/bibliography.adoc
+++ b/documentation/IDTA-01004/modules/ROOT/pages/bibliography.adoc
@@ -13,13 +13,13 @@ SPDX-License-Identifier: CC-BY-4.0
 
 [#bib1]
 [1] IDTA 01001 Specification of the Asset Administration Shell.
-Part 1: Metamodel, Version 3.1. Industrial Digital Twin Association (IDTA), January 2025. Online.
-Available: https://industrialdigitaltwin.io/aas-specifications/IDTA-01001/v3.1/index.html
+Part 1: Metamodel, Version 3.2. Industrial Digital Twin Association (IDTA). Online.
+Available: https://industrialdigitaltwin.org/en/content-hub/aasspecifications
 
 [#bib2]
 [2] IDTA 01002 Specification of the Asset Administration Shell.
-Part 2: Application Programming Interfaces, Version 3.1. Industrial Digital Twin Association (IDTA), January 2025. Online.
-Available: https://industrialdigitaltwin.io/aas-specifications/IDTA-01002/v3.1/index.html
+Part 2: Application Programming Interfaces, Version 3.2. Industrial Digital Twin Association (IDTA). Online.
+Available: https://industrialdigitaltwin.org/en/content-hub/aasspecifications
 
 [#bib3]
 [3] IDTA 01003-a Specification of the Asset Administration Shell.
diff --git a/documentation/IDTA-01004/modules/ROOT/pages/index.adoc b/documentation/IDTA-01004/modules/ROOT/pages/index.adoc
index bb23ae6..c06ff19 100644
--- a/documentation/IDTA-01004/modules/ROOT/pages/index.adoc
+++ b/documentation/IDTA-01004/modules/ROOT/pages/index.adoc
@@ -27,12 +27,32 @@ Previous version: 3.0.
 
 This document uses the following parts and versions of the “Specification of the Asset Administration Shell” series:
 
-* IDTA-01001 Part 1: Metamodel in version 3.1 xref:bibliography.adoc#bib1[[1\]]
-* IDTA-01002 Part 2: Application Programming Interfaces in version 3.1 xref:bibliography.adoc#bib2[[2\]]
+* IDTA-01001 Part 1: Metamodel in version 3.2 xref:bibliography.adoc#bib1[[1\]]
+* IDTA-01002 Part 2: Application Programming Interfaces in version 3.2 xref:bibliography.adoc#bib2[[2\]]
 * IDTA-01003-a Part 3a: Data Specification – IEC 61360 in version 3.1 xref:bibliography.adoc#bib3[[3\]]
 
 If there are bugfixes of the parts, these shall be used.
 
+[#cross-spec-alignment]
+=== Alignment with other AAS Specifications
+
+This version of IDTA-01004 (v3.1) is designed to be used together with the following companion specifications:
+
+[cols="2,2,3",options="header"]
+|===
+| Specification | Aligned Version | Notes
+
+| IDTA-01001 Part 1: Metamodel
+| v3.2
+| Defines the classes referenced by FieldIdentifier prefixes (`$aas`, `$sm`, `$sme`, `$cd`, `$aasdesc`, `$smdesc`).
+
+| IDTA-01002 Part 2: Application Programming Interfaces
+| v3.2
+| HTTP/REST API and AAS Query Language. IDTA-01002 and IDTA-01004 share the same BNF grammar and JSON Schema for formula expressions; the Query Language chapter in IDTA-01002 is normative for formula semantics.
+|===
+
+Bugfix (patch) releases of aligned specifications MAY be substituted. Implementations conforming to this version of IDTA-01004 SHOULD declare which versions of IDTA-01001 and IDTA-01002 they implement.
+
 == Notice
 
 Copyright: Industrial Digital Twin Association e.V. (IDTA)