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diff --git a/doc/emacs.texi b/doc/emacs.texi
index 575e87c262..d124eca3cb 100644
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+++ b/doc/emacs.texi
@@ -166,6 +166,11 @@ Display package(s) located in the specified file.  These files usually
 have the following form: @file{gnu/packages/emacs.scm}, but don't type
 them manually!  Press @key{TAB} to complete the file name.
 
+@item M-x guix-package-from-file
+Display package that the code within the specified file evaluates to.
+@xref{Invoking guix package, @code{--install-from-file}}, for an example
+of what such a file may look like.
+
 @item M-x guix-search-by-regexp
 Search for packages by a specified regexp.  By default ``name'',
 ``synopsis'' and ``description'' of the packages will be searched.  This