diff --git a/kaldi-decoder/csrc/decodable-ctc.h b/kaldi-decoder/csrc/decodable-ctc.h
index 5ffb979..7b9a419 100644
--- a/kaldi-decoder/csrc/decodable-ctc.h
+++ b/kaldi-decoder/csrc/decodable-ctc.h
@@ -17,7 +17,7 @@ class DecodableCtc : public DecodableInterface {
 
   // It shares the memory with the input array.
   //
-  // @param p Pointer to a 2-d array  of shape (num_rows, num_rows).
+  // @param p Pointer to a 2-d array of shape (num_rows, num_cols).
   //          The array should be kept alive as long as this object is still
   //          alive.
   DecodableCtc(const float *p, int32_t num_rows, int32_t num_cols);