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-rw-r--r--docs/ref/templates/builtins.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/ref/templates/builtins.txt b/docs/ref/templates/builtins.txt
index 9d4093e4da..e66c583720 100644
--- a/docs/ref/templates/builtins.txt
+++ b/docs/ref/templates/builtins.txt
@@ -1688,6 +1688,11 @@ For example::
If ``value`` is ``['a', 'b', 'c', 'd']`` or ``"abcd"``, the output will be
``4``.
+.. versionchanged:: 1.8
+
+ The filter returns ``0`` for an undefined variable. Previously, it returned
+ an empty string.
+
.. templatefilter:: length_is
length_is