diff --git a/sherpa-onnx/csrc/audio-tagging-model-config.cc b/sherpa-onnx/csrc/audio-tagging-model-config.cc
index f95bfadd5..f1f526f80 100644
--- a/sherpa-onnx/csrc/audio-tagging-model-config.cc
+++ b/sherpa-onnx/csrc/audio-tagging-model-config.cc
@@ -8,6 +8,15 @@ namespace sherpa_onnx {
 
 void AudioTaggingModelConfig::Register(ParseOptions *po) {
   zipformer.Register(po);
+
+  po->Register("num-threads", &num_threads,
+               "Number of threads to run the neural network");
+
+  po->Register("debug", &debug,
+               "true to print model information while loading it.");
+
+  po->Register("provider", &provider,
+               "Specify a provider to use: cpu, cuda, coreml");
 }
 
 bool AudioTaggingModelConfig::Validate() const {
diff --git a/sherpa-onnx/csrc/audio-tagging.cc b/sherpa-onnx/csrc/audio-tagging.cc
index ee1e2b3f7..34d558dd9 100644
--- a/sherpa-onnx/csrc/audio-tagging.cc
+++ b/sherpa-onnx/csrc/audio-tagging.cc
@@ -52,6 +52,7 @@ std::string AudioTaggingConfig::ToString() const {
 
   os << "AudioTaggingConfig(";
   os << "model=" << model.ToString() << ", ";
+  os << "labels=\"" << labels << "\", ";
   os << "top_k=" << top_k << ")";
 
   return os.str();
diff --git a/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.cc b/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.cc
index 519821a03..8a2e80dc2 100644
--- a/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.cc
+++ b/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.cc
@@ -66,7 +66,8 @@ class OfflineZipformerAudioTaggingModel::Impl {
       SHERPA_ONNX_LOGE("%s\n", os.str().c_str());
     }
 
-    // get vocab size from the output[0].shape, which is (N, num_event_classes)
+    // get num_event_classes from the output[0].shape,
+    // which is (N, num_event_classes)
     num_event_classes_ =
         sess_->GetOutputTypeInfo(0).GetTensorTypeAndShapeInfo().GetShape()[1];
   }
diff --git a/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.h b/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.h
index d2ae6963a..282823499 100644
--- a/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.h
+++ b/sherpa-onnx/csrc/offline-zipformer-audio-tagging-model.h
@@ -20,7 +20,7 @@ namespace sherpa_onnx {
  * from icefall.
  *
  * See
- * https://github.com/k2-fsa/icefall/blob/master/egs/librispeech/ASR/zipformer/export-onnx-ctc.py
+ * https://github.com/k2-fsa/icefall/blob/master/egs/audioset/AT/zipformer/export-onnx.py
  */
 class OfflineZipformerAudioTaggingModel {
  public:
@@ -46,7 +46,7 @@ class OfflineZipformerAudioTaggingModel {
    */
   Ort::Value Forward(Ort::Value features, Ort::Value features_length) const;
 
-  /** Return the vocabulary size of the model
+  /** Return the number of event classes of the model
    */
   int32_t NumEventClasses() const;