diff --git a/Tools/ttroundtrip b/Tools/ttroundtrip
index f17137865..44dd2ae2a 100755
--- a/Tools/ttroundtrip
+++ b/Tools/ttroundtrip
@@ -1,14 +1,16 @@
 #! /usr/bin/env python
 
-"""ttroundtrip [options] font1 ... fontN
-Dump each TT/OT font as a TTX file, compile again to TTF or OTF and dump again.
-Then do a diff on the two TTX files. Append problems and diffs to a file called
-"report.txt" in the current directory. This is only for testing FontTools/TTX,
-the resulting files are deleted afterwards.
+"""usage: ttroundtrip [options] font1 ... fontN
 
-This tool supports some of ttdump's command line options (-i, -t and -x)
-and they will in fact be passed to ttdump. -t or -x will imply ttcompile -i
-on the way back.
+    Dump each TT/OT font as a TTX file, compile again to TTF or OTF
+    and dump again. Then do a diff on the two TTX files. Append problems
+    and diffs to a file called "report.txt" in the current directory.
+    This is only for testing FontTools/TTX, the resulting files are
+    deleted afterwards.
+    
+    This tool supports some of ttdump's command line options (-i, -t
+    and -x) and they will in fact be passed to ttdump. Specifying -t
+    or -x implies ttcompile -i <originalfile> on the way back.
 """
 
 import sys