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-rw-r--r--chapter01/docs/01-grammar.md1
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diff --git a/chapter01/docs/01-grammar.md b/chapter01/docs/01-grammar.md
index cf947dfc..5d9f3cf7 100644
--- a/chapter01/docs/01-grammar.md
+++ b/chapter01/docs/01-grammar.md
@@ -21,5 +21,6 @@ primaryExpression
INTEGER_LITERAL
: [1-9][0-9]*
+ | [0]
;
``` \ No newline at end of file