diff --git a/doc/api.rst b/doc/api.rst
index 397675065f..3ab3e79139 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -100,6 +100,7 @@ Data
     from_numpyro
     from_pystan
     from_tfp
+    concat
 
 Utils
 -----