diff --git a/opennmt/decoders/rnn_decoder.py b/opennmt/decoders/rnn_decoder.py
index ecb838060..036c129c1 100644
--- a/opennmt/decoders/rnn_decoder.py
+++ b/opennmt/decoders/rnn_decoder.py
@@ -116,7 +116,7 @@ def decode(self,
 
     output_layer = self._build_output_layer(vocab_size)
 
-    # With TraningHelper, project all timesteps at once.
+    # With TrainingHelper, project all timesteps at once.
     fused_projection = isinstance(helper, tf.contrib.seq2seq.TrainingHelper)
 
     decoder = tf.contrib.seq2seq.BasicDecoder(