diff --git a/src/mlpack/methods/hmm/hmm_train_main.cpp b/src/mlpack/methods/hmm/hmm_train_main.cpp
index b8a411eb83..6b16b9587d 100644
--- a/src/mlpack/methods/hmm/hmm_train_main.cpp
+++ b/src/mlpack/methods/hmm/hmm_train_main.cpp
@@ -27,7 +27,7 @@ PROGRAM_INFO("Hidden Markov Model (HMM) Training", "This program allows a "
     "--model_file.");
 
 PARAM_STRING_REQ("input_file", "File containing input observations.", "i");
-PARAM_STRING_REQ("type", "Type of HMM: discrete | gaussian | gmm", "t");
+PARAM_STRING_REQ("type", "Type of HMM: discrete | gaussian | gmm.", "t");
 
 PARAM_FLAG("batch", "If true, input_file (and if passed, labels_file) are "
     "expected to contain a list of files to use as input observation sequences "