diff --git a/string.rb b/string.rb
index b410e09395..be10b407b0 100644
--- a/string.rb
+++ b/string.rb
@@ -90,7 +90,7 @@
# which contains string after match.
# - \` corresponds to $`,
# which contains string before match.
-# - \+ corresponds to $+,
+# - \\+ corresponds to $+,
# which contains last capture group.
#
# See rdoc-ref:regexp.rdoc for details.