diff --git a/src/GeometricBase.jl b/src/GeometricBase.jl
index a047dff..c981cd4 100644
--- a/src/GeometricBase.jl
+++ b/src/GeometricBase.jl
@@ -11,6 +11,7 @@ module GeometricBase
     include("abstract_integrator.jl")
     include("abstract_solution.jl")
     include("abstract_solver.jl")
+    include("abstract_solver_state.jl")
 
     include("data/system_types.jl")
     include("data/data_types.jl")
diff --git a/src/abstract_solver_state.jl b/src/abstract_solver_state.jl
new file mode 100644
index 0000000..df2f6fe
--- /dev/null
+++ b/src/abstract_solver_state.jl
@@ -0,0 +1,12 @@
+
+export AbstractSolverState, isAbstractSolverState
+
+"""
+    AbstractSolverState
+
+The state is used in solvers and optimizers to translate information about previous solver/optimization steps to successive iterations.
+"""
+abstract type AbstractSolverState end
+
+isAbstractSolverState(::Any) = false
+isAbstractSolverState(::AbstractSolverState) = true
\ No newline at end of file