diff --git a/Steepfile b/Steepfile
index 752f598..ee191dc 100644
--- a/Steepfile
+++ b/Steepfile
@@ -6,6 +6,7 @@ target :lib do
   check "lib"                       # Directory name
   # ignore "lib/templates/*.rb"
 
+  library "fileutils"
   # library "pathname"              # Standard libraries
   # library "strong_json"           # Gems
   # library "phlex"
diff --git a/lib/phlexite/router.rb b/lib/phlexite/router.rb
index 6f14490..2363b53 100644
--- a/lib/phlexite/router.rb
+++ b/lib/phlexite/router.rb
@@ -17,6 +17,12 @@ class Phlexite::Router
     File::write(out, component.call)
   end
 
+  def mount(local_directory, on:)
+    out = full_out_path(on)
+    FileUtils::mkdir_p out
+    FileUtils::cp_r File::join(local_directory, "."), out
+  end
+
 private
 
   def full_out_path(out_path)
diff --git a/sig/phlexite.rbs b/sig/phlexite.rbs
index 5eedd1f..3710de4 100644
--- a/sig/phlexite.rbs
+++ b/sig/phlexite.rbs
@@ -8,6 +8,7 @@ module Phlexite
     def initialize: (String, Site) -> void
     def page: (String, untyped) -> void
     def group: (String) { (Router) -> void } -> void
+    def mount: (String, on: String) -> void
 
     private
     def full_out_path: (String) -> String