From 4127f82179acb13746c6249dd420ffa8b4abeb72 Mon Sep 17 00:00:00 2001
From: Cristian Adam <cristian.adam@gmail.com>
Date: Mon, 20 May 2019 22:40:17 +0200
Subject: add_library: Document UNKNOWN type of imported targets

---
 Help/command/add_library.rst | 6 ++++++
 1 file changed, 6 insertions(+)

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
 ^^^^^^^^^^^^^^^^
 
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