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diff --git a/rosetta1.mdwn b/rosetta1.mdwn
index 0a09c7c9..1c603674 100644
--- a/rosetta1.mdwn
+++ b/rosetta1.mdwn
@@ -78,7 +78,7 @@ These relations are written in Haskell and OCaml as `&&`, `||`, and `not`. (Hask
 The values that are written `'true` and `'false` in Kapulet are written in Haskell as `True` and `False`, and in OCaml as just `true` and `false`. (It'd be more consistent with OCaml's other naming policies for them to have said True and False<!-- other value constructors must be capitalized -->, but they didn't.) These are written `#t` and `#f` in Scheme, but in Scheme in many contexts any value that isn't `#f` will behave as though it were `#t`, even values you might think are more "false-like", like `0` and the empty list.
 <a id=truth-like></a> Thus `(if 0 'zero 'nope)` will evaluate to `'zero`.
 
-Some Scheme implementations, such as Racket, permit `#true` and `#false` as synonyms for `#t` and `#f`.
+Some Scheme implementations, such as Racket, permit `#true` and `#false` as synonyms for `#t` and `#f`. (These aliases are also mandated in "version 7", r7rs, of the Scheme standard.)
 
 Scheme also recognizes the values `'true` and `'false`, but it treats `'false` as distinct from `#f`, and thus as a "truth-like" value, like all of its other values that aren't `#f`. Kapulet essentially took Scheme's `boolean` values and collapsed them into being a subtype of its `symbol` values.
 <!-- This is also what it does with Scheme's `char`s ?? see [[below|rosetta1#chars]] -->