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-rw-r--r--range.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/range.c b/range.c
index 4526dcb..d2d9a70 100644
--- a/range.c
+++ b/range.c
@@ -711,9 +711,12 @@ sym_each_i(RB_BLOCK_CALL_FUNC_ARGLIST(v, arg))
* call-seq:
* rng.size -> num
*
- * Returns the number of elements in the range.
+ * Returns the number of elements in the range. Both the begin and the end of
+ * the Range must be Numeric, otherwise nil is returned.
*
* (10..20).size #=> 11
+ * ('a'..'z').size #=> nil
+ * (-Float::INFINITY..Float::INFINITY).size #=> Infinity
*/
static VALUE