Update Remove-RetentionCompliancePolicy.md

Author: chrisda

exchange/exchange-ps/exchange/policy-and-compliance-retention/Remove-RetentionCompliancePolicy.md

@@ -23,6 +23,8 @@ Remove-RetentionCompliancePolicy [-Identity] <PolicyIdParameter> [-Confirm] [-Fo
 ```
 
 ## DESCRIPTION
+New policies are not valid and will not be applied until a retention rule is added to the policy. In addition, at least one location parameter must be defined to create a retention policy. 
+
 You need to be assigned permissions in the Office 365 Security & Compliance Center before you can use this cmdlet. For more information, see Permissions in Office 365 Security & Compliance Center (https://go.microsoft.com/fwlink/p/?LinkId=511920).
 
 ## EXAMPLES