diff --git a/tren.py b/tren.py
index 076792b..498759d 100755
--- a/tren.py
+++ b/tren.py
@@ -6,7 +6,7 @@
 # Program Information
 
 PROGNAME = "tren.py"
-RCSID = "$Id: tren.py,v 1.105 2010/01/23 00:38:55 tundra Exp $"
+RCSID = "$Id: tren.py,v 1.106 2010/01/23 01:00:00 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -59,6 +59,7 @@
 #####
 
 ALL          =  "All"       # Rename target is whole filename
+COMMENT      =  "#"         # Comment character in include files
 EXT          =  "Ext"       # Rename target is extension
 EXTDELIM     =  "."         # Extension delimeter
 INCL         =  "-I"        # Include file command line option
@@ -306,12 +307,14 @@
         ErrorMsg(eTOOMANYINC)
         sys.exit(1)
 
-    # Replace insert option on the command line with that file's contents
+    # Replace insert option on the command line with that file's contents.
+    # Handle comments within lines.
 
     try:
         n = []
         f = open(file)
         for l in f.readlines():
+            l = l.split(COMMENT)[0]
             n += l.split()
         f.close()