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-rw-r--r--README4
1 files changed, 3 insertions, 1 deletions
diff --git a/README b/README
index 05eccd0ee..f2189ac96 100644
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@@ -2450,7 +2450,9 @@ 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. Here are some examples:
+a locator, and a suffix. The citation key must begin with a letter
+or `_`, and may contain alphanumerics, `_`, and internal punctuation
+characters (`:.#$%&-+?<>~/`). Here are some examples:
Blah blah [see @doe99, pp. 33-35; also @smith04, ch. 1].