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-rw-r--r--docs/CommandGuide/FileCheck.rst5
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diff --git a/docs/CommandGuide/FileCheck.rst b/docs/CommandGuide/FileCheck.rst
index 44cc57cebafe..9078f65e01c5 100644
--- a/docs/CommandGuide/FileCheck.rst
+++ b/docs/CommandGuide/FileCheck.rst
@@ -86,6 +86,11 @@ OPTIONS
All other variables get undefined after each encountered ``CHECK-LABEL``.
+.. option:: -D<VAR=VALUE>
+
+ Sets a filecheck variable ``VAR`` with value ``VALUE`` that can be used in
+ ``CHECK:`` lines.
+
.. option:: -version
Show the version number of this program.