Cover letter for I-129F,k3 visa ,spouse petition is below:
 
<petitioner’s name>
                                                                                    <petitioner’s address>
                                                                                    <petitioner’s phone>
                                    
United States Department of Homeland Security
U.S. Citizenship and Immigration Services
<service center address>
 
                                                                                    <today’s date>
 
Re: I-129F petition
Dear Sir or Madam:
Enclosed please find the Form I-129F, Petition for K-3 spouse for <beneficiary’s name> and supporting documents as follows:
 

• Application fee  - $<455>.
• Form I-129F
• Evidence of my US citizenship
• Form G-325A and photograph of the petitioner
• Form G-325A and photograph of the beneficiary
• Form FC-029
• Copy of our marriage certificate
• Copy of I-797C, Notice of Action, receipt notice for filing Form I-130

 
Copies of documents submitted are exact photocopies of unaltered documents and I agree to submit original documents to an Immigration or Consular officer at a later date, if required.
 
Yours truly,
 
<petitioner’s signature>
<petitioner’s name>