diff --git a/doc/Expr.adoc b/doc/Expr.adoc
index bbfd53f..0682a96 100644
--- a/doc/Expr.adoc
+++ b/doc/Expr.adoc
@@ -1888,7 +1888,7 @@ At each iteration, the following automatic variables are available for use in th
 
 * `$_`: the current element of the iterator.
 * `$__`: the index of the current element in the iterator, starting from 0.
-* `$_#`: the number of elements already visited in the iterator, starting from 0.
+* `$#`: the number of elements already visited in the iterator, starting from 0.
 
 ---