Add information about Kernel#binding

1 files changed, 20 insertions, 0 deletions

diff --git a/doc/limitations.md b/doc/limitations.md
index 9d8924cff..afcb7b56e 100644
--- a/doc/limitations.md
+++ b/doc/limitations.md
@@ -185,3 +185,23 @@ The re-defined ```+``` operator does not accept any arguments.
 
 ``` 'ab' ```
 Behavior of the operator wasn't changed.
+
+## Kernel#binding is not supported
+
+`Kernel#binding` method is not supported.
+
+#### Ruby [ruby 2.5.1p57 (2018-03-29 revision 63029)]
+
+```
+$ ruby -e 'puts Proc.new {}.binding'
+#<Binding:0x00000e9deabb9950>
+```
+
+#### mruby [1.4.1 (2018-4-27)]
+
+```
+$ ./bin/mruby -e 'puts Proc.new {}.binding'
+trace (most recent call last):
+        [0] -e:1
+-e:1: undefined method 'binding' (NoMethodError)
+```