diff --git a/base/multidimensional.jl b/base/multidimensional.jl
index e85400ebd355a..fb50624abe322 100644
--- a/base/multidimensional.jl
+++ b/base/multidimensional.jl
@@ -1302,11 +1302,14 @@ end
 hash(x::Prehashed) = x.hash
 
 """
-    unique(itr[, dim])
+    unique(A::AbstractArray[, dim::Int])
+
+Return an array containing only the unique elements of `A`, as determined by
+[`isequal`](@ref), in the order that the first of each set of equivalent elements
+originally appears.
+
+If `dim` is specified, return unique regions of `A` along dimension `dim`.
 
-Returns an array containing only the unique elements of the iterable `itr`, in
-the order that the first of each set of equivalent elements originally appears.
-If `dim` is specified, returns unique regions of the array `itr` along `dim`.
 
 ```jldoctest
 julia> A = map(isodd, reshape(collect(1:8), (2,2,2)))
diff --git a/base/set.jl b/base/set.jl
index 38665b5f55d94..0d19af6e20437 100644
--- a/base/set.jl
+++ b/base/set.jl
@@ -123,8 +123,9 @@ const ⊆ = issubset
 """
     unique(itr)
 
-Returns an array containing one value from `itr` for each unique value,
-as determined by [`isequal`](@ref).
+Return an array containing only the unique elements of collection `itr`,
+as determined by [`isequal`](@ref), in the order that the first of each
+set of equivalent elements originally appears.
 
 ```jldoctest
 julia> unique([1; 2; 2; 6])