diff --git a/doc_source/aws-attribute-updatepolicy.md b/doc_source/aws-attribute-updatepolicy.md
index e16fef9a9..90a6a9ce6 100644
--- a/doc_source/aws-attribute-updatepolicy.md
+++ b/doc_source/aws-attribute-updatepolicy.md
@@ -97,7 +97,7 @@ Specifies the maximum number of instances that AWS CloudFormation updates\.
 *Required*: No
 
 `MinInstancesInService`  <a name="cfn-attributes-updatepolicy-rollingupdate-mininstancesinservice"></a>
-Specifies the minimum number of instances that must be in service within the Auto Scaling group while AWS CloudFormation updates old instances\.  
+Specifies the minimum number of instances that must be in service within the Auto Scaling group while AWS CloudFormation updates old instances\. Must be less than the Auto Scaling group's Max size.
 *Default*: `0`  
 *Type*: Integer  
 *Required*: No
@@ -478,4 +478,4 @@ Alias:
       DeploymentGroupName: !Ref CodeDeployDeploymentGroup
       BeforeAllowTrafficHook: !Ref PreHookLambdaFunction
       AfterAllowTrafficHook: !Ref PreHookLambdaFunction
-```
\ No newline at end of file
+```