Fixed type

trainer/src/macaon_train.cpp

@@ -86,7 +86,7 @@ po::options_description getOptionsDescription()
     ("maskRate", po::value<float>()->default_value(0.0),
       "The rate of elements of the Tape that will be masked.")
     ("printTime", "Print time on stderr.")
-    ("featureExtraction", "Use macaon only a feature extractor, print corpus to stdout.")
+    ("featureExtraction", "Use macaon only as a feature extractor, print corpus to stdout.")
     ("devEvalOnGold", "If true, dev accuracy will be computed on gold configurations.")
     ("devLoss", po::value<bool>()->default_value(false),
       "Compute and print total loss on dev for every epoch.")