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-rw-r--r--docs/MakefileGuide.rst3
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diff --git a/docs/MakefileGuide.rst b/docs/MakefileGuide.rst
index f86d3e11e2..3e90907886 100644
--- a/docs/MakefileGuide.rst
+++ b/docs/MakefileGuide.rst
@@ -699,6 +699,9 @@ The override variables are given below:
``CFLAGS``
Additional flags to be passed to the 'C' compiler.
+``CPPFLAGS``
+ Additional flags passed to the C/C++ preprocessor.
+
``CXX``
Specifies the path to the C++ compiler.