diff --git a/New-GitHubMarkdownIndex/New-GitHubMarkdownIndex.ps1 b/New-GitHubMarkdownIndex/New-GitHubMarkdownIndex.ps1
index 513c5f9..e620038 100644
--- a/New-GitHubMarkdownIndex/New-GitHubMarkdownIndex.ps1
+++ b/New-GitHubMarkdownIndex/New-GitHubMarkdownIndex.ps1
@@ -4,16 +4,45 @@ function New-GitHubMarkdownIndex {
 Function to generate an index to be used in markdown files
 #>
     param(
-        $Path = 'C:\Temp\Events',
-        $GitHubUri = 'https://github.com/jaapbrasser/events/tree/master'
+        # The path of the file structure that will be mapped in markdown
+        [string] $Path = 'C:\Temp\Events',
+        # The GitHub uri that files will be linked to
+        [string] $GitHubUri = 'https://github.com/jaapbrasser/events/tree/master',
+        # Included file types, specified by extension
+        [string[]] $IncludeExtensions = @('.md','pdf'),
+        # Whether to use clip.exe or to output to console
+        [switch] $NoClipBoard
     )
-    Get-ChildItem -LiteralPath $Path | % {
-        $GHPath = $_.FullName -replace [regex]::Escape($Path) -replace '\\','/' -replace '\s','%20'
-        "* [$(Split-Path $_ -Leaf)]($GitHubUri$GHPath)"
-        $_ | ls -recurse | ? {$_.PSIsContainer -or $_.Extension -eq '.md'} | select -exp fullname | % {
-            $Count = ($_ -split '\\').Count-($Path.Split('\').Count+1)
-            $GHPath = $_ -replace [regex]::Escape($Path) -replace '\\','/' -replace '\s','%20'
-            "$(" "*$Count*2)* [$(Split-Path $_ -Leaf)]($GitHubUri$GHPath)"
+    
+    begin {
+        $IncludeExtensions = $IncludeExtensions | ForEach-Object {
+            if ($_ -notmatch '^\.') {
+                ".$_"
+            } else {
+                $_
+            }
         }
-    } | clip.exe
+
+        $BuildMarkDown = {
+            Get-ChildItem -LiteralPath $Path | ForEach-Object {
+                $GHPath = $_.FullName -replace [regex]::Escape($Path) -replace '\\','/' -replace '\s','%20'
+                "* [$(Split-Path $_ -Leaf)]($GitHubUri$GHPath)"
+                if ($_.PSIsContainer) {
+                    $_ | Get-ChildItem -Recurse | ? {$_.PSIsContainer -or $_.Extension -in $IncludeExtensions} | ForEach-Object {
+                        $Count = ($_.FullName -split '\\').Count-($Path.Split('\').Count+1)
+                        $GHPath = $_.FullName -replace [regex]::Escape($Path) -replace '\\','/' -replace '\s','%20'
+                        "$(" "*$Count*2)* [$(Split-Path $_ -Leaf)]($GitHubUri$GHPath)"
+                    }
+                }
+            }
+        }
+    }
+        
+    process {
+        if ($NoClipBoard) {
+            $BuildMarkDown.Invoke()
+        } else {
+            $BuildMarkDown.Invoke() | clip.exe
+        }
+    }
 }