diff --git a/src/rax.h b/src/rax.h
index db8c4632f..b9be8618e 100644
--- a/src/rax.h
+++ b/src/rax.h
@@ -41,7 +41,7 @@
  * provided inside the representation. So the above representation is turned
  * into:
  *
- *                  ["foo"] ""
+ *                  ("foo") ""
  *                     |
  *                  [t   b] "foo"
  *                  /     \