diff --git a/speechx/examples/decoder/offline_decoder_main.cc b/speechx/examples/decoder/offline_decoder_main.cc
index 344b09acdf8596476dfc169bede3c9b7a35f3c84..cffca39a6ebcb6584bcaad6f0116d3bdfea05a74 100644
--- a/speechx/examples/decoder/offline_decoder_main.cc
+++ b/speechx/examples/decoder/offline_decoder_main.cc
@@ -23,10 +23,10 @@
 #include "nnet/paddle_nnet.h"
 
 DEFINE_string(feature_respecifier, "", "test feature rspecifier");
-DEFINE_string(model_path, "avg_1.jit.pdmodel", "xxx.pdmodel");
-DEFINE_string(param_path, "avg_1.jit.pdiparams", "xxx.pdiparams");
-DEFINE_string(dict_file, "vocab.txt", "xxx.pdmodel");
-DEFINE_string(lm_path, "lm.klm", "xxx.pdiparams");
+DEFINE_string(model_path, "avg_1.jit.pdmodel", "paddle nnet model");
+DEFINE_string(param_path, "avg_1.jit.pdiparams", "paddle nnet model param");
+DEFINE_string(dict_file, "vocab.txt", "vocabulary of lm");
+DEFINE_string(lm_path, "lm.klm", "language model");
 
 
 using kaldi::BaseFloat;
diff --git a/speechx/speechx/frontend/raw_audio.h b/speechx/speechx/frontend/raw_audio.h
index b55f717d9ffca643377fa88f75bf947717bab104..1a326b3cf70270bbb013e414aa63ca8cb61b0701 100644
--- a/speechx/speechx/frontend/raw_audio.h
+++ b/speechx/speechx/frontend/raw_audio.h
@@ -26,7 +26,7 @@ class RawAudioCache : public FeatureExtractorInterface {
   public:
     explicit RawAudioCache(int buffer_size = kint16max);
     virtual void Accept(const kaldi::VectorBase<BaseFloat>& waves);
-    virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* feat);
+    virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* waves);
     // the audio dim is 1
     virtual size_t Dim() const { return 1; }
     virtual void SetFinished() {
@@ -76,4 +76,4 @@ class RawDataCache : public FeatureExtractorInterface {
     DISALLOW_COPY_AND_ASSIGN(RawDataCache);
 };
 
-}  // namespace ppspeech
\ No newline at end of file
+}  // namespace ppspeech