diff --git a/layers/tacotron.py b/layers/tacotron.py
index 034f682b..1f0d0be6 100644
--- a/layers/tacotron.py
+++ b/layers/tacotron.py
@@ -67,6 +67,7 @@ class BatchNormConv1d(nn.Module):
 
 
 class Highway(nn.Module):
+    # TODO: Try GLU layer
     def __init__(self, in_size, out_size):
         super(Highway, self).__init__()
         self.H = nn.Linear(in_size, out_size)