2 files changed, 6 insertions, 0 deletions
diff --git a/tool/lib/output.rb b/tool/lib/output.rb
index 5e0e878322..584be76974 100644
--- a/tool/lib/output.rb
+++ b/tool/lib/output.rb
@@ -10,6 +10,7 @@ class Output
   end
 
   def def_options(opt)
+    opt.separator("  Output common options:")
     opt.on('-o', '--output=PATH') {|v| @path = v}
     opt.on('-t', '--timestamp[=PATH]') {|v| @timestamp = v || true}
     opt.on('-c', '--[no-]if-change') {|v| @ifchange = v}
diff --git a/tool/lib/vpath.rb b/tool/lib/vpath.rb
index a52f840c30..fa819f3242 100644
--- a/tool/lib/vpath.rb
+++ b/tool/lib/vpath.rb
@@ -53,6 +53,7 @@ class VPath
   end
 
   def def_options(opt)
+    opt.separator("  VPath common options:")
     opt.on("-I", "--srcdir=DIR", "add a directory to search path") {|dir|
       @additional << dir
     }
@@ -80,6 +81,10 @@ class VPath
     @list
   end
 
+  def add(path)
+    @additional << path
+  end
+
   def strip(path)
     prefix = list.map {|dir| Regexp.quote(dir)}
     path.sub(/\A#{prefix.join('|')}(?:\/|\z)/, '')