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-rw-r--r--lib/erb.rb5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/erb.rb b/lib/erb.rb
index d88cce9f4b..e72fe95572 100644
--- a/lib/erb.rb
+++ b/lib/erb.rb
@@ -999,8 +999,9 @@ class ERB
# See [Default Binding][default binding].
#
# Argument `symbols` is an array of symbols;
- # each symbol `symbol` is used to define (unless already defined) a variable in the binding
- # whose name is `symbol` and whose value is `nil`.
+ # each symbol `symbol` is defined as a new variable to hide and
+ # prevent it from overwriting a variable of the same name already
+ # defined within the binding.
#
# [default binding]: rdoc-ref:ERB@Default+Binding
def new_toplevel(vars = nil)