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@@ -2616,7 +2616,7 @@ can be found at <https://github.com/citation-style-language/styles>. See also
Citations go inside square brackets and are separated by semicolons.
Each citation must have a key, composed of '@' + the citation
identifier from the database, and may optionally have a prefix,
-a locator, and a suffix. The citation key must begin with a letter
+a locator, and a suffix. The citation key must begin with a letter, digit,
or `_`, and may contain alphanumerics, `_`, and internal punctuation
characters (`:.#$%&-+?<>~/`). Here are some examples: