diff --git a/src/learn.jl b/src/learn.jl
index 25b1694..a2f4b8e 100644
--- a/src/learn.jl
+++ b/src/learn.jl
@@ -28,7 +28,7 @@ function learn!(kfn::kfn_1, correctAnswer::AbstractVector)
     for (i, out) in enumerate(outs)
         if out != correctAnswer[i]   # need to adjust weight
             kfnError = ( (kfn.outputNeuronsArray[i].v_th - kfn.outputNeuronsArray[i].vError) * 
-                        100 / kfn.outputNeuronsArray[i].v_th ) * 0.1   # 0.1 for scaling down error
+                        100 / kfn.outputNeuronsArray[i].v_th )
 
             Threads.@threads for n in kfn.neuronsArray
             # for n in kfn.neuronsArray