diff --git a/src/FDM/flight.cxx b/src/FDM/flight.cxx
index 8bd66f39a..b52b337c0 100644
--- a/src/FDM/flight.cxx
+++ b/src/FDM/flight.cxx
@@ -1,4 +1,4 @@
-// flight.c -- a general interface to the various flight models
+// flight.cxx -- a general interface to the various flight models
 //
 // Written by Curtis Olson, started May 1997.
 //