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-rw-r--r--range.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/range.c b/range.c
index 2763b323ebe..d781af3f2e5 100644
--- a/range.c
+++ b/range.c
@@ -353,6 +353,7 @@ range_step_size(VALUE range, VALUE args, VALUE eobj)
* call-seq:
* rng.step(n=1) {| obj | block } -> rng
* rng.step(n=1) -> an_enumerator
+ * rng.step(n=1) -> an_arithmetic_sequence
*
* Iterates over the range, passing each <code>n</code>th element to the block.
* If begin and end are numeric, +n+ is added for each iteration.
@@ -360,6 +361,8 @@ range_step_size(VALUE range, VALUE args, VALUE eobj)
* range elements.
*
* If no block is given, an enumerator is returned instead.
+ * Especially, the enumerator is an Enumerator::ArithmeticSequence
+ * if begin and end of the range are numeric.
*
* range = Xs.new(1)..Xs.new(10)
* range.step(2) {|x| puts x}