diff --git a/features/consolidated_resource.feature b/features/consolidated_resource.feature
index c70e04727..b0a6e6908 100644
--- a/features/consolidated_resource.feature
+++ b/features/consolidated_resource.feature
@@ -895,3 +895,9 @@ Feature: Consolidated Resource
     Given a resource type YAML with sandbox_strategy "overlay"
     When I load the resource type via from_yaml
     Then the loaded schema sandbox_strategy should be "overlay"
+
+
+  Scenario: Invalid sandbox_strategy error message lists overlay as allowed
+    Given a resource type YAML with invalid sandbox_strategy
+    When I try to load the resource type via from_yaml
+    Then the schema loader should fail with "overlay"
diff --git a/src/cleveragents/infrastructure/sandbox/strategy_registry.py b/src/cleveragents/infrastructure/sandbox/strategy_registry.py
index 5d7335f7a..79e598326 100644
--- a/src/cleveragents/infrastructure/sandbox/strategy_registry.py
+++ b/src/cleveragents/infrastructure/sandbox/strategy_registry.py
@@ -81,8 +81,8 @@ class SandboxStrategyRegistry:
     :class:`SandboxStrategyProtocol` at registration time.
 
     Built-in strategies (``none``, ``git_worktree``, ``copy_on_write``,
-    ``transaction_rollback``) are not managed by this registry; they
-    are handled by :class:`SandboxFactory`.
+    ``transaction_rollback``, ``snapshot``, ``overlay``) are not managed
+    by this registry; they are handled by :class:`SandboxFactory`.
 
     Usage::