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-rw-r--r--doc/source/format_declaring.rst22
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diff --git a/doc/source/format_declaring.rst b/doc/source/format_declaring.rst
index 4631ee3e8..a809676fc 100644
--- a/doc/source/format_declaring.rst
+++ b/doc/source/format_declaring.rst
@@ -420,3 +420,25 @@ dependency and that all referenced variables are declared, the following is fine
install-commands:
- |
%{make-install} RELEASE_TEXT="%{release-text}"
+
+
+Variables declared by BuildStream
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+BuildStream declares a set of :ref:`builtin <project_builtin_defaults>`
+variables that may be overridden. In addition, the following
+read-only variables are also dynamically declared by BuildStream:
+
+* ``element-name``
+
+ The name of the element being processed (e.g base/alpine.bst).
+
+* ``project-name``
+
+ The name of project where BuildStream is being used.
+
+* ``max-jobs``
+
+ Maximum number of parallel build processes within a given
+ build, support for this is conditional on the element type
+ and the build system used (any element using 'make' can
+ implement this).