diff --git a/lib/elixir/lib/keyword.ex b/lib/elixir/lib/keyword.ex
index 2260538317a..cc8883b6a3d 100644
--- a/lib/elixir/lib/keyword.ex
+++ b/lib/elixir/lib/keyword.ex
@@ -20,10 +20,17 @@ defmodule Keyword do
       iex> [{:active, :once}]
       [active: :once]
 
-  The two syntaxes are completely equivalent. Note that when keyword
-  lists are passed as the last argument to a function, if the short-hand
-  syntax is used then the square brackets around the keyword list can
-  be omitted as well. For example, the following:
+  The two syntaxes are completely equivalent. When using the colon syntax,
+  the key is always an atom, even when wrapped in quotes:
+  
+      iex> ["exit_on_close": true]
+      [exit_on_close: true]
+  
+  This mirrors the quoted atom syntax such as `:"exit_on_close"`.
+  
+  Note that when keyword lists are passed as the last argument to a function,
+  if the short-hand syntax is used then the square brackets around the keyword list
+  can be omitted as well. For example, the following:
 
       String.split("1-0", "-", trim: true, parts: 2)