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@@ -139,8 +139,8 @@ module ActionController
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       # those that were not used to generate a particular route. The extra
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       # keys also do not include those recalled from the prior request, nor
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       # do they include any keys that were implied in the route (like a
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-      # :controller that is required, but not explicitly used in the text of
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-      # the route.)
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+      # <tt>:controller</tt> that is required, but not explicitly used in the
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+      # text of the route.)
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       def extra_keys(hash, recall={})
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         (hash || {}).keys.map { |k| k.to_sym } - (recall || {}).keys - significant_keys
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       end