diff --git a/thinc/api.py b/thinc/api.py
index <HASH>..<HASH> 100644
--- a/thinc/api.py
+++ b/thinc/api.py
@@ -12,7 +12,7 @@ from .util import to_categorical, get_width, xp2torch, torch2xp
 from .backends import get_ops, set_current_ops, get_current_ops, use_device
 from .backends import Ops, CupyOps, NumpyOps
 
-from .layers import Affine, Dropout, Embed, ExtractWindow, HashEmbed, LayerNorm
+from .layers import Affine, CauchySimilarity, Dropout, Embed, ExtractWindow, HashEmbed, LayerNorm
 from .layers import Maxout, Mish, MultiSoftmax, ReLu, Residual, Softmax, BiLSTM, LSTM
 
 from .layers import add, bidirectional, chain, clone, concatenate, foreach, noop
add CauchySimilarity also to api