Salesforce lightning aura add red asterick for <lightning:input

Salesforce lightning aura add red asterick for

<div class="slds-form-element"> <label class="slds-form-element__label" for="cusinfocomp-input4"> <aura:if isTrue="{!v.required}"> <abbr class="slds-required" title="required" aura:id="emailReq">* </abbr> </aura:if> Email Address </label> <div class="slds-form-element__control"> <ui:inputText aura:id="cusinfocomp-input4" class="slds-input" value="{!v.contact.Email}" blur="{!c.checkValidate}"/> </div> </div>

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