diff --git a/README.md b/README.md
index 0d6e312..e2549a6 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,10 @@ This package aims to provide light-weight performant tooling without requiring a
 
 Alternatively see the [MacroTools](https://github.com/MikeInnes/MacroTools.jl) package for more powerful set of tools.
 
-Currently, this package provides the `splitdef` and `combinedef` functions which are useful for inspecting and manipulating function definition expressions.
+Currently, this package provides the `splitdef`, `signature` and `combinedef` functions which are useful for inspecting and manipulating function definition expressions.
+ - `splitdef` works on a function definition expression and returns a `Dict` of its parts.
+ - `signature` works on a `Method` returning a similar `Dict` that holds the parts of the expressions that would form its signature.
+ - `combinedef` takes such `Dict` and builds it back into an expression
 
 e.g.
 ```julia
@@ -40,6 +43,18 @@ julia> def[:head] = :(=);
 
 julia> def[:body] = :(x * y);
 
-julia> combinedef(def)
+julia> g_expr = combinedef(def)
 :((g(x::T, y::T) where T) = x * y)
-```
\ No newline at end of file
+
+julia> eval(g_expr)
+g (generic function with 1 method)
+
+julia> g_method = first(methods(g))
+g(x::T, y::T) where T in Main
+
+julia> signature(g_method)
+Dict{Symbol,Any} with 3 entries:
+  :name        => :g
+  :args        => Expr[:(x::T), :(y::T)]
+  :whereparams => Any[:T]
+```
diff --git a/docs/src/api.md b/docs/src/api.md
index 9d110ad..f005fd7 100644
--- a/docs/src/api.md
+++ b/docs/src/api.md
@@ -10,4 +10,5 @@ CurrentModule = ExprTools
 ```@docs
 splitdef
 combinedef
+signature
 ```
diff --git a/docs/src/index.md b/docs/src/index.md
index d0bbcb6..08ec38b 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -5,7 +5,16 @@ This package aims to provide light-weight performant tooling without requiring a
 
 Alternatively see the [MacroTools](https://github.com/MikeInnes/MacroTools.jl) package for more powerful set of tools.
 
-Currently, this package provides the `splitdef` and `combinedef` functions which are useful for inspecting and manipulating function definition expressions.
+
+ExprTools provides tooling for working with Julia expressions during [metaprogramming](https://docs.julialang.org/en/v1/manual/metaprogramming/).
+This package aims to provide light-weight performant tooling without requiring additional package dependencies.
+
+Alternatively see the [MacroTools](https://github.com/MikeInnes/MacroTools.jl) package for more powerful set of tools.
+
+Currently, this package provides the `splitdef`, `signature` and `combinedef` functions which are useful for inspecting and manipulating function definition expressions.
+ - [`splitdef`](@ref) works on a function definition expression and returns a `Dict` of its parts.
+ - [`signature`](@ref) works on a `Method` returning a similar `Dict` that holds the parts of the expressions that would form its signature.
+ - [`combinedef`](@ref) takes such `Dict` and builds it back into an expression
 
 e.g.
 ```jldoctest
@@ -35,6 +44,18 @@ julia> def[:head] = :(=);
 
 julia> def[:body] = :(x * y);
 
-julia> combinedef(def)
+julia> g_expr = combinedef(def)
 :((g(x::T, y::T) where T) = x * y)
-```
\ No newline at end of file
+
+julia> eval(g_expr)
+g (generic function with 1 method)
+
+julia> g_method = first(methods(g))
+g(x::T, y::T) where T in Main
+
+julia> signature(g_method)
+Dict{Symbol,Any} with 3 entries:
+  :name        => :g
+  :args        => Expr[:(x::T), :(y::T)]
+  :whereparams => Any[:T]
+```
diff --git a/src/type_utils.jl b/src/type_utils.jl
index a0bbc91..110cb5d 100644
--- a/src/type_utils.jl
+++ b/src/type_utils.jl
@@ -3,10 +3,7 @@
 
 Extracts the type-parameters of the `type`.
 
-```jldoctest
-julia> parameters(Foo{A, B, C}) == [A, B, C]
-true
-```
+e.g. `parameters(Foo{A, B, C}) == [A, B, C]`
 """
 parameters(sig::UnionAll) = parameters(sig.body)
 parameters(sig::DataType) = sig.parameters