Tweak usage string.
diff --git a/bin/charcode.dart b/bin/charcode.dart
index e354656..e4e7fab 100644
--- a/bin/charcode.dart
+++ b/bin/charcode.dart
@@ -997,10 +997,16 @@
code of "y", then `$x`, `$why` and `$z` as well.
Flags:
- -h | --help: Print this text.
- -H | --html: Include HTML entity names in default names.
- -f | --file FILE: Read commands from lines of FILE.
- -o | --output FILE: Write output to FILE instead of stdoutSTDOUT.
- -p | --prefix ID: Use ID as prefix. Must be a valid identifier start.
- -v | --verbose: Increase verbosity. (Not used yet.)
+ -h | --help:
+ Print this text.
+ -fFILE | -f FILE | --input=FILE | --input FILE :
+ Read commands from lines of FILE.
+ -oFILE | -o FILE | --output=FILE | --output FILE :
+ Write output to FILE instead of stdoutSTDOUT.
+ -pID | --prefix=ID:
+ Use ID as prefix. Must be empty or a valid identifier start.
+ -H | --html:
+ Include HTML entity names in default names.
+ -v | --verbose:
+ Increase verbosity.
""";
