diff --git a/src/interface.jl b/src/interface.jl
index 7dfc94e..bf3273f 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -92,7 +92,7 @@ julia> println(result)
 # Signature
 """
 function jsoncorrection(jsonstring::T, example::String, commfunction::Function; maxattempt=3
-)::NamedTuple{(:result, :errormsg, :success), Tuple{Union{String, Nothing}, Union{String, Nothing}, Bool}} where {T<:AbstractString}
+  )::NamedTuple{(:result, :errormsg, :success), Tuple{String, Union{String, Nothing}, Bool}} where {T<:AbstractString}
 
   initialstate = Dict{Symbol, Any}(
     :reward=> 0,
@@ -123,8 +123,8 @@ function jsoncorrection(jsonstring::T, example::String, commfunction::Function;
 end
 
 
-function transition(state::T1, args::NamedTuple
-  ) where {T1<:AbstractDict}
+function transition(state::T, args::NamedTuple
+  )::NamedTuple{(:newNodeKey, :newstate, :progressvalue), Tuple{String, T, Integer}} where {T<:AbstractDict}
 
   decisionMakerF::Function = args[:decisionMaker]
   evaluatorF::Function = args[:evaluator]