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-rw-r--r--Help/command/add_library.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Help/command/add_library.rst b/Help/command/add_library.rst
index b42fe42..7274e44 100644
--- a/Help/command/add_library.rst
+++ b/Help/command/add_library.rst
@@ -94,6 +94,12 @@ The most important properties are:
See documentation of the ``IMPORTED_*`` and ``INTERFACE_*`` properties
for more information.
+An ``UNKNOWN`` library type is typically only used in the implementation of
+:ref:`Find Modules`. It allows the path to an imported library (often found
+using the :command:`find_library` command) to be used without having to know
+what type of library it is. This is especially useful on Windows where a
+static library and a DLL's import library both have the same file extension.
+
Object Libraries
^^^^^^^^^^^^^^^^