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-rw-r--r--llvm/docs/CommandGuide/FileCheck.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/docs/CommandGuide/FileCheck.rst b/llvm/docs/CommandGuide/FileCheck.rst
index 830b1e00d4e..6581b33ba1c 100644
--- a/llvm/docs/CommandGuide/FileCheck.rst
+++ b/llvm/docs/CommandGuide/FileCheck.rst
@@ -24,6 +24,9 @@ match. The file to verify is read from standard input unless the
OPTIONS
-------
+Options are parsed from the environment variable ``FILECHECK_OPTS``
+and from the command line.
+
.. option:: -help
Print a summary of command line options.
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