diff --git a/build.hancho b/build.hancho
index 84d9fd9..39b8044 100644
--- a/build.hancho
+++ b/build.hancho
@@ -1,3 +1,6 @@
+config.verbose = True
+config.jobs = 1
+
 Rule()([], [], desc = "Run all tests",         command = "cd tests && rm -rf build && ./test.py 2> /dev/null")
 Rule()([], [], desc = "Build all tutorials",   command = "cd tutorial && rm -rf build && hancho --quiet")
 Rule()([], [], desc = "Build hello_world",     command = "cd examples/hello_world && rm -rf build && hancho --quiet")
diff --git a/hancho.py b/hancho.py
index 64d5b74..e156673 100755
--- a/hancho.py
+++ b/hancho.py
@@ -112,22 +112,14 @@ def touch(name):
     if isinstance(name, Rule):
         for f in name.files_out:
             touch(f)
-    if os.path.exists(name):
+        return name.files_out
+    elif os.path.exists(name):
         os.utime(name, None)
+        return name
     else:
         with open(name, "w") as file:
             file.write("")
-
-
-async def async_touch(task):
-    """Convenience helper method"""
-    for name in task.files_out:
-        if os.path.exists(name):
-            os.utime(name, None)
-        else:
-            with open(name, "w") as file:
-                file.write("")
-    return task.files_out
+        return name
 
 ################################################################################
 
diff --git a/tests/rules.hancho b/tests/rules.hancho
index d22eecd..bc146bb 100644
--- a/tests/rules.hancho
+++ b/tests/rules.hancho
@@ -14,5 +14,5 @@ compile_cpp = Rule(
 )
 
 touch_outputs = Rule(
-  command = async_touch
+  command = touch
 )
diff --git a/tutorial/tut4.hancho b/tutorial/tut4.hancho
index 3cee4f6..072ce43 100644
--- a/tutorial/tut4.hancho
+++ b/tutorial/tut4.hancho
@@ -1,11 +1,11 @@
 # tutorial/tut4.hancho - Async/await and custom commands
 import asyncio
-import os
 
 config.build_dir = "build/tut4"
 
-# You can use promises that return arrays of filenames in place of actual
-# filenames in rules.
+# Functions (synchronous or asynchronous) that return filenames or arrays of
+# filenames can be used in place of actual filenames in rules.
+
 async def do_slow_thing():
   print("Doing slow thing")
   await asyncio.sleep(0.1)
@@ -19,8 +19,10 @@ echo = Rule(
 echo(do_slow_thing(), [])
 
 # You can also use them in the command field.
-async def custom_command(task):
-  await async_touch(task)
+def custom_command(task):
+  for f in task.files_out:
+    with open(f, "a") as file:
+      file.write("asdf\n")
   return task.files_out
 
 custom_rule = Rule(