diff --git a/components/schemas/containers/config/ContainerRuntime.yml b/components/schemas/containers/config/ContainerRuntime.yml
index 0efa7c8b..d54f716c 100644
--- a/components/schemas/containers/config/ContainerRuntime.yml
+++ b/components/schemas/containers/config/ContainerRuntime.yml
@@ -130,6 +130,11 @@ properties:
             type:
               - boolean
               - "null"
+          expose_instances_dir:
+            description: If true, Cycle will mount the host's instances directory into the container at `/var/run/cycle/host/instances`.
+            type:
+              - boolean
+              - "null"
           power_management:
             description: If true, Cycle will give the container instances access via internal api to power off or reboot the host server.
             type:
diff --git a/stackspec/schema/StackSpecContainerConfigRuntime.yml b/stackspec/schema/StackSpecContainerConfigRuntime.yml
index 1c47e198..a686d11f 100644
--- a/stackspec/schema/StackSpecContainerConfigRuntime.yml
+++ b/stackspec/schema/StackSpecContainerConfigRuntime.yml
@@ -186,6 +186,13 @@ properties:
                   - boolean
                   - "null"
               - $ref: StackVariable.yml
+          expose_instances_dir:
+            description: If true, Cycle will mount the host's instances directory into the container at `/var/run/cycle/host/instances`.
+            oneOf:
+              - type:
+                  - boolean
+                  - "null"
+              - $ref: StackVariable.yml
           power_management:
             description: If true, Cycle will give the container instances access via internal api to power off or reboot the host server.
             oneOf: