diff --git a/guides/release-notes/v3.0.13.adoc b/guides/release-notes/v3.0.13.adoc
index e75f4014..2fe60836 100644
--- a/guides/release-notes/v3.0.13.adoc
+++ b/guides/release-notes/v3.0.13.adoc
@@ -17,7 +17,7 @@ Release date:: May 2024
 
 * Catalogue transaction (T19)
 ** Added possibility (by use of a code) to indicate if an item is non-returnable after purchase. The element cac:TransactionConditions/cbc:ActionCode on item-level is used and the code is added to the codelist "Transaction condition code (OpenPeppol)", together with the previous code to indicate if an item is contracted (CT). The element cbc:ActionCode was previously fixed to the value 'CT' since it was the only allowed code, but with this change, it can be used for both purposes.
-
+** Time may be given with time zone information.
 
 == Changes to code lists and validation artefacts
 
diff --git a/guides/shared/datatypes/time.adoc b/guides/shared/datatypes/time.adoc
index b8fad8c9..b46a014f 100644
--- a/guides/shared/datatypes/time.adoc
+++ b/guides/shared/datatypes/time.adoc
@@ -1,11 +1,14 @@
 
 = Time
 
-Time shall be in accordance to the “Extended time format” as specified by {ISO8601}, format [hh]:[mm]:[ss].
-
+Time shall be in accordance to the “Extended time format” as specified by {ISO8601}, +
+  - format without time zone [hh]:[mm]:[ss] +
+  - format with UTC timezone [hh]:[mm]:[ss]Z +
+  - format for other zones   [hh]:[mm]:[ss]±[hh:mm] with zone is given as difference from UTC.
 
 ====
-IMPORTANT: Time shall *not* include timezone information. Decimal fraction on seconds SHALL not be used.
+IMPORTANT: Time may include timezone information. +
+Decimal fraction on seconds SHALL not be used.
 ====