diff --git a/doc/source/accumulators.rst b/doc/source/accumulators.rst
index 80788c696..9712db3f4 100644
--- a/doc/source/accumulators.rst
+++ b/doc/source/accumulators.rst
@@ -26,6 +26,8 @@ There are different ways to construct an accumulator/counter::
 
   a = counter(seq)         # construct a counter by counting keys in a sequence
 
+  a = counter(gen)         # construct a counter by counting keys in a generator
+
 
 Usage of an accumulator/counter::
 
diff --git a/src/accumulator.jl b/src/accumulator.jl
index 6437765e7..6d0ad79ab 100644
--- a/src/accumulator.jl
+++ b/src/accumulator.jl
@@ -24,6 +24,14 @@ function counter(seq::AbstractArray{T}) where T
     return ct
 end
 
+function counter(gen::T) where {T<:Base.Generator}
+    ct = counter(Base._default_eltype(T))
+    for x in gen
+        push!(ct, x)
+    end
+    return ct
+end
+
 copy(ct::Accumulator{T,V}) where {T,V<:Number} = Accumulator{T,V}(copy(ct.map))
 
 length(a::Accumulator) = length(a.map)
diff --git a/test/test_accumulator.jl b/test/test_accumulator.jl
index 704c28398..add6ad88e 100644
--- a/test/test_accumulator.jl
+++ b/test/test_accumulator.jl
@@ -97,8 +97,12 @@
     @test ct6["b"] == 0
     @test ct6["c"] == 4
 
+    s = ["y", "el", "sol", "se", "fue"]
+    @test counter(length(x) for x in s) == counter(map(length, s))
+  
     # ambiguity resolution
     ct7 = counter(Int)
     @test_throws MethodError push!(ct7, 1=>2)
 
 end # @testset Accumulators
+