Fix comment

src/google/protobuf/compiler/command_line_interface.h

@@ -358,8 +358,8 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // FileDescriptorSet should be written.  Otherwise, empty.
   string descriptor_set_name_;
 
-  // If --dependency_out was given, this is the filename to which the input file
-  // should be written.  Otherwise, empty.
+  // If --dependency_out was given, this is the path to the file where the
+  // dependency file will be written. Otherwise, empty.
   string dependency_out_name_;
 
   // True if --include_imports was given, meaning that we should