diff --git a/Project.toml b/Project.toml
index e876afd..43a03d4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "FieldProperties"
 uuid = "127e4479-4c95-493a-afaa-609d38175b70"
 authors = ["zchristensen "]
-version = "0.4.0"
+version = "0.4.1"
 
 [deps]
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
diff --git a/src/general.jl b/src/general.jl
index c0017a6..3d695db 100644
--- a/src/general.jl
+++ b/src/general.jl
@@ -25,13 +25,13 @@ Property providing name for parent structure.
 Specifies maximum element for display purposes. If not specified returns the maximum value in the collection.
 """
 @defprop CalibrationMaximum{:calmax}::(x::AbstractArray->eltype(x)) begin
-    @getproperty x -> maximum(x)
+    @getproperty x::AbstractArray -> maximum(x)
 end
 
 """
 Specifies minimum element for display purposes. If not specified returns the minimum value in the collection.
 """
 @defprop CalibrationMinimum{:calmin}::(x::AbstractArray->eltype(x)) begin
-    @getproperty x -> minimum(x)
+    @getproperty x::AbstractArray -> minimum(x)
 end
 
diff --git a/test/metadata_tests.jl b/test/metadata_tests.jl
index 017bb05..831221f 100644
--- a/test/metadata_tests.jl
+++ b/test/metadata_tests.jl
@@ -13,6 +13,9 @@
     @test get!(m, :a, 3) == 1
 
     @test m.a == 1
+    m[:a] = 2
+    @test m.a == 2
+
     @test m.b == 2
     m.b = 3
     @test m.b == 3
diff --git a/test/runtests.jl b/test/runtests.jl
index 28a968d..fda19fd 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -21,14 +21,25 @@ t = TestStruct(1,2,3,4,5)
 
 @test propertynames(t) == (:prop1,:prop2,:prop3,:prop4)
 
-
 FieldProperties._fxnname(FieldProperties.Description{values}()) == "description(values)"
 
-
 x = rand(4,4)
 @test @inferred(calmin(x)) == minimum(x)
 @test @inferred(calmax(x)) == maximum(x)
 
+struct ArrayLike{T,N}
+    a::Array{T,N}
+    calmax::T
+    calmin::T
+end
+
+xdiff = -(extrema(x)...)
+xmax = maximum(x) - .25 * xdiff
+xmin = minimum(x) + .25 * xdiff
+a = ArrayLike(x, xmax, xmin)
+@test calmax(a) == xmax
+@test calmin(a) == xmin
+
 include("metadata_tests.jl")
 
 @testset "FieldProperties docs" begin