diff --git a/dual_net.py b/dual_net.py
index eb57f585d..55004dea2 100644
--- a/dual_net.py
+++ b/dual_net.py
@@ -136,6 +136,11 @@
     'SE_ratio', 2,
     help='Squeeze and Excitation ratio.')
 
+flags.DEFINE_bool(
+    'use_swish', False,
+    help=('Use Swish activation function inplace of ReLu. '
+         'https://arxiv.org/pdf/1710.05941.pdf'))
+
 
 # TODO(seth): Verify if this is still required.
 flags.register_multi_flags_validator(
@@ -406,6 +411,9 @@ def model_inference_fn(features, training, params):
         data_format="channels_last")
 
     def mg_activation(inputs):
+        if FLAGS.use_swish:
+            return tf.nn.swish(inputs)
+
         return tf.nn.relu(inputs)