diff --git a/src/Flux.jl b/src/Flux.jl
index 768e851c..f9268829 100644
--- a/src/Flux.jl
+++ b/src/Flux.jl
@@ -24,6 +24,7 @@ export SGD, ADAM, ADAMW, AdaMax, Momentum, Nesterov,
        RMSProp, ADAGrad, ADADelta, AMSGrad, NADAM
 
 include("utils.jl")
+# export stop
 include("onehot.jl")
 include("treelike.jl")
 
diff --git a/src/utils.jl b/src/utils.jl
index c53f7864..1e119148 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -153,3 +153,9 @@ function jacobian(m,x)
     end
     J'
 end
+
+struct StopException <: Exception end
+
+function stop()
+  throw(StopException)
+end
\ No newline at end of file