mention why labels from define_combinator are important

GMDU · Sep 25, 2020 · e01450d · e01450d
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commit e01450d
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diff --git a/README.md b/README.md
@@ -177,6 +177,9 @@ between(lit("<"), lit(">"), lit("foo")).label
 #=> 'between(lit("<"), lit(">"), lit("foo"))'
 ```
 
+Having labels that resemble the source code is helpful for [the error
+messages](#expectationfailed).
+
 If we use `def` instead of `define_combinator`, then the label would be
 that of its definition. In the following case, it would be that assigned by
 `<`.