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-rw-r--r--Help/manual/OPTIONS_BUILD.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Help/manual/OPTIONS_BUILD.txt b/Help/manual/OPTIONS_BUILD.txt
index 810aaa914c..0947e41cbf 100644
--- a/Help/manual/OPTIONS_BUILD.txt
+++ b/Help/manual/OPTIONS_BUILD.txt
@@ -18,6 +18,9 @@
containing :command:`set` commands that use the ``CACHE`` option, not a
cache-format file.
+ References to :variable:`CMAKE_SOURCE_DIR` and :variable:`CMAKE_BINARY_DIR`
+ within the script evaluate to the top-level source and build tree.
+
``-D <var>:<type>=<value>, -D <var>=<value>``
Create or update a CMake ``CACHE`` entry.