An update of sorts.

1 files changed, 6 insertions, 0 deletions

diff --git a/docs/c1/grammar/index.md b/docs/c1/grammar/index.md
index 5bedbfc..d70021a 100644
--- a/docs/c1/grammar/index.md
+++ b/docs/c1/grammar/index.md
@@ -59,6 +59,9 @@ The following limits are not represented in the grammar:
   terribly confusing for a human reader.  Consider: `#foobarbaz`.
   This would parse as a `Datum` joining `#foobar` and `baz`.
 
+  (The ABNF does not suffer from this issue, since it explicitly
+   enumerates the join possibilities anyway.)
+
 * A `Label` is the hexadecimal representation of a 48-bit integer,
   meaning it allows for a maximum of 12 hexadecimal digits.  Longer
   values are grammatical, but signal an out-of-range error, so as to
@@ -67,6 +70,9 @@ The following limits are not represented in the grammar:
   signal an invalid character error at the letter `d` if the grammar
   limited a `Label` to 12 hexadecimal digits.
 
+  (As above, the ABNF doesn't care about this.  You probably don't
+   want to use the ABNF to generate a parser anyway.)
+
 
 ## Stream-parsing strategy