diff --git a/releases/1.4.0/index.md b/releases/1.4.0/index.md
index ace4b35..884d1fb 100644
--- a/releases/1.4.0/index.md
+++ b/releases/1.4.0/index.md
@@ -26,6 +26,7 @@ UCO 2.0.0 **will** consider the following breaking changes.  They are implemente
 
 * Warned if target or source on an `ObservableRelationship` are not `Observable`s ([*GitHub Issue 573*](https://github.com/ucoProject/UCO/issues/573))
 * Warned of prior disjointedness declarations in `core:` and `types:` ([*GitHub Issue 586*](https://github.com/ucoProject/UCO/issues/586))
+* Warned if an `AlternateDataStream` instance is not also a `FileSystemObject` ([*GitHub Issue 590*](https://github.com/ucoProject/UCO/issues/590))
 
 
 #### Changes
diff --git a/releases/2.0.0/index.md b/releases/2.0.0/index.md
index 8e7ec77..f0a835b 100644
--- a/releases/2.0.0/index.md
+++ b/releases/2.0.0/index.md
@@ -46,6 +46,7 @@ custom_css: releases
 * Aligned `types:Thread` with `core:UcoInherentCharacterizationThing` ([*GitHub Issue 509*](https://github.com/ucoProject/UCO/issues/509))
 * Designated `observable:ObservablePattern` a subclass of `pattern:Pattern` ([*GitHub Issue 543*](https://github.com/ucoProject/UCO/issues/543))
 * Designated `action:ActionLifecycle` a subclass of `action:ActionPattern` ([*GitHub Issue 556*](https://github.com/ucoProject/UCO/issues/556))
+* Changed `AlternateDataStream` parent class to `FileSystemObject` ([*GitHub Issue 590*](https://github.com/ucoProject/UCO/issues/590))
 
 
 ## Documentation