diff --git a/src/MPSDynamics.jl b/src/MPSDynamics.jl
index ca8eaaf..980d483 100644
--- a/src/MPSDynamics.jl
+++ b/src/MPSDynamics.jl
@@ -163,7 +163,7 @@ export Machine, RemoteMachine, LocalMachine, init_machines, update_machines, lau
 
 export randtree
 
-export readchaincoeffs, h5read, load
+export readchaincoeffs, h5read, load, findchainlength
 
 export println, print, show