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-rw-r--r--Help/command/string.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/Help/command/string.rst b/Help/command/string.rst
index e226aa1a48..0e69b27ebc 100644
--- a/Help/command/string.rst
+++ b/Help/command/string.rst
@@ -576,6 +576,9 @@ Functionality for querying a JSON string.
Set an element in ``<json-string>`` at the location
given by the list of ``<member|index>`` arguments to ``<value>``.
The contents of ``<value>`` should be valid JSON.
+ If ``<json-string>`` is an array, ``<value>`` can be appended to the end of
+ the array by using a number greater or equal to the array length as the
+ ``<member|index>`` argument.
.. signature::
string(JSON <out-var> [ERROR_VARIABLE <error-var>]