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diff --git a/doc/lispref/intro.texi b/doc/lispref/intro.texi
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@@ -530,6 +530,18 @@ directory (without cleaning). This is only of relevance when
developing Emacs.
@end defvar
+@defvar emacs-repository-version
+A string that gives the repository revision from which Emacs was
+built. If Emacs was built outside revision control, the value is
+@code{nil}.
+@end defvar
+
+@defvar emacs-repository-branch
+A string that gives the repository branch from which Emacs was built.
+In the most cases this is @code{"master"}. If Emacs was built outside
+revision control, the value is @code{nil}.
+@end defvar
+
@node Acknowledgments
@section Acknowledgments