Add compat annotation

JuliaLang · Sep 2, 2019 · f8e9ac5 · f8e9ac5
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diff --git a/NEWS.md b/NEWS.md
@@ -31,7 +31,7 @@ Standard library changes
 
 * The methods of `mktemp` and `mktempdir` which take a function body to pass temporary paths to no longer throw errors if the path is already deleted when the function body returns ([#33091]).
 
-* A new `dropdims(f, args...; dims, kwargs...)` method computes the reduction `f` over the region described by `dims` and then drops those dimensions from the result ([#23500]).
+* A new `dropdims(f, args...; dims, kwargs...)` method computes the reduction `f` over the region described by `dims` and then drops those dimensions from the result ([#33130]).
 
 #### Libdl
 

diff --git a/base/abstractarraymath.jl b/base/abstractarraymath.jl
@@ -92,6 +92,9 @@ _dropdims(A::AbstractArray, dim::Integer) = _dropdims(A, (Int(dim),))
 
 Compute reduction `f` over dimensions `dims` and drop those dimensions from the result.
 
+!!! compat "Julia 1.4"
+    This function requires at least Julia 1.4.
+
 # Examples
 ```jldoctest
 julia> a = [3.0  2.0  6.0  8.0