Find and replace word VBA macro to search folder and subfolders - vba

Question

I currently have this VBA macro that can search through a single folder for docx files and run find and replace in headers and footers. I am new to VBA and just good and manipulations of code, and was wondering how I can could modify this one to add in the ability to search subfolders as well?
Sub FindAndReplaceInFolder()
Dim objDoc As Document
Dim strFile As String
Dim strFolder As String
Dim strFindText As String
Dim strReplaceText As String
Dim xSelection As Selection
Dim xSec As Section
Dim xHeader As HeaderFooter
Dim xFooter As HeaderFooter
' Pop up input boxes for user to enter folder path, the finding and replacing texts.
strFolder = InputBox("Enter folder path here:")
strFile = Dir(strFolder & "" & "\*.docx", vbNormal)
strFindText = InputBox("Enter finding text here:")
strReplaceText = InputBox("Enter replacing text here:")
' Open each file in the folder to search and replace texts. Save and close the file after the action.
While strFile \<\> ""
Set objDoc = Documents.Open(FileName:=strFolder & "" & strFile)
With objDoc
For Each xSec In objDoc.Sections
For Each xHeader In xSec.Headers
xHeader.Range.Select
Set xSelection = objDoc.Application.Selection
With xSelection
.HomeKey Unit:=wdStory
With xSelection.Find
.Text = strFindText
.Replacement.Text = strReplaceText
.Forward = True
.Wrap = wdFindContinue
.Format = False
.MatchCase = False
.MatchWholeWord = False
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False
End With
xSelection.Find.Execute Replace:=wdReplaceAll
End With
Next xHeader
For Each xFooter In xSec.Footers
xFooter.Range.Select
Set xSelection = objDoc.Application.Selection
With xSelection
.HomeKey Unit:=wdStory
With xSelection.Find
.Text = strFindText
.Replacement.Text = strReplaceText
.Forward = True
.Wrap = wdFindContinue
.Format = False
.MatchCase = False
.MatchWholeWord = False
.MatchWildcards = False
.MatchSoundsLike = False
.MatchAllWordForms = False
End With
xSelection.Find.Execute Replace:=wdReplaceAll
End With
Next xFooter
Next xSec
objDoc.Save
objDoc.Close
strFile = Dir()
End With
Wend
End Sub
Not sure how to get started with this so looking for some help