diff --git a/nav.py b/nav.py
index 995a4a3..aadfa3c 100644
--- a/nav.py
+++ b/nav.py
@@ -67,6 +67,10 @@ def plan(destination):
     return route, total, total / CRUISE_SPEED, fuel
 
 
+def asteroid_route(belt
+    # TODO: figure out how to route through the asteroid belt
+
+
 def print_plan(destination):
     """Print the flight plan for a destination."""
     route, total, days, fuel = plan(destination)