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-rw-r--r--Help/command/set_property.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Help/command/set_property.rst b/Help/command/set_property.rst
index ec08c8f..1728c98 100644
--- a/Help/command/set_property.rst
+++ b/Help/command/set_property.rst
@@ -66,7 +66,8 @@ the property to set. Remaining arguments are used to compose the
property value in the form of a semicolon-separated list.
If the ``APPEND`` option is given the list is appended to any existing
-property value. If the ``APPEND_STRING`` option is given the string is
+property value (except that empty values are ignored and not appended).
+If the ``APPEND_STRING`` option is given the string is
appended to any existing property value as string, i.e. it results in a
longer string and not a list of strings. When using ``APPEND`` or
``APPEND_STRING`` with a property defined to support ``INHERITED``