details how a corner case behaves in different Ruby versions

1 files changed, 2 insertions, 2 deletions

diff --git a/activesupport/lib/active_support/core_ext/string/access.rb b/activesupport/lib/active_support/core_ext/string/access.rb
index 57385d86d2..bf11d16365 100644
--- a/activesupport/lib/active_support/core_ext/string/access.rb
+++ b/activesupport/lib/active_support/core_ext/string/access.rb
@@ -5,7 +5,7 @@ class String
     # Examples: 
     #   "hello".at(0)  # => "h"
     #   "hello".at(4)  # => "o"
-    #   "hello".at(10) # => nil
+    #   "hello".at(10) # => ERROR if < 1.9, nil in 1.9
     def at(position)
       mb_chars[position, 1].to_s
     end
@@ -15,7 +15,7 @@ class String
     # Examples: 
     #   "hello".from(0)  # => "hello"
     #   "hello".from(2)  # => "llo"
-    #   "hello".from(10) # => nil
+    #   "hello".from(10) # => "" if < 1.9, nil in 1.9
     def from(position)
       mb_chars[position..-1].to_s
     end