diff --git a/csla-examples/CustomSerializers.md b/csla-examples/CustomSerializers.md
index 8a9919a..a81c10b 100644
--- a/csla-examples/CustomSerializers.md
+++ b/csla-examples/CustomSerializers.md
@@ -179,7 +179,8 @@ The `SerializationInfo` class can store the following "primitive" types:
 - `Guid`
 - `byte[]`
 - `char[]`
-- `List<int>` (and other primitive type lists)
+
+> ⚠️ Standard .NET collection types such as `List<T>` and `Dictionary<K,V>` are _not_ directly serializable by `MobileFormatter`. Use `MobileList<T>` or `MobileDictionary<K,V>` from `Csla.Core` for serializable collections, or register a custom serializer for your collection type.
 
 ## Common Scenarios
 
diff --git a/csla-examples/v10/CustomSerializers.md b/csla-examples/v10/CustomSerializers.md
index f8b5575..bf260d9 100644
--- a/csla-examples/v10/CustomSerializers.md
+++ b/csla-examples/v10/CustomSerializers.md
@@ -97,10 +97,11 @@ The `SerializationInfo` class can store these primitive types:
 | Text | `string`, `char`, `char[]` |
 | Boolean | `bool` |
 | Date/Time | `DateTime`, `DateTimeOffset`, `TimeSpan`, `DateOnly`, `TimeOnly` |
-| Other | `Guid`, `byte[]` |
-| Collections | `List<T>` of primitive types |
+| Other | `Guid`, `byte[]`, `char[]` |
 | Nullable | Nullable versions of all above types |
 
+> ⚠️ Standard .NET collection types such as `List<T>` and `Dictionary<K,V>` are _not_ directly serializable by `MobileFormatter`. Use `MobileList<T>` or `MobileDictionary<K,V>` from `Csla.Core` for serializable collections, or register a custom serializer for your collection type.
+
 For complex types, serialize them as JSON strings or implement child object handling.
 
 ## Handling Complex Types
diff --git a/csla-examples/v9/PocoSerialization.md b/csla-examples/v9/PocoSerialization.md
index 1213b97..f832c49 100644
--- a/csla-examples/v9/PocoSerialization.md
+++ b/csla-examples/v9/PocoSerialization.md
@@ -242,9 +242,10 @@ The `SerializationInfo` class can store these "primitive" types directly:
 - `Guid`
 - `byte[]`
 - `char[]`
-- `List<int>` (and other primitive type lists)
 - Nullable versions of the above types
 
+> ⚠️ Standard .NET collection types such as `List<T>` and `Dictionary<K,V>` are _not_ directly serializable by `MobileFormatter`. Use `MobileList<T>` or `MobileDictionary<K,V>` from `Csla.Core` for serializable collections, or register a custom serializer for your collection type.
+
 For complex types (objects, lists of objects), use the child object methods.
 
 ## Best Practices