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-rw-r--r--chapter10/docs/10-grammar.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/chapter10/docs/10-grammar.md b/chapter10/docs/10-grammar.md
index 01863e7f..29ca7762 100644
--- a/chapter10/docs/10-grammar.md
+++ b/chapter10/docs/10-grammar.md
@@ -92,6 +92,7 @@ multiplicativeExpression
unaryExpression
: ('-') unaryExpression
+ | '!' unaryExpression
| primaryExpression
;