diff --git a/NEWS b/NEWS
index 917679189..798fce1d6 100644
--- a/NEWS
+++ b/NEWS
@@ -30,7 +30,7 @@ standard "dlopen" interface, providing a limited shim for platforms with
 similar functionality exposed under different names (MinGW).
 
 This change has a few practical impacts to Guile users.  There is a new
-library search path variable, `GUILE_EXTENSIONS_DIR'.  Also, errors when
+library search path variable, `GUILE_EXTENSIONS_PATH'.  Also, errors when
 loading a library fails now have better errors.  And Guile no longer has
 a libltdl dependency.
 
@@ -96,9 +96,9 @@ See "Ports" in the manual.
 
 See "Bytevector Ports" in the manual.
 
-** `GUILE_EXTENSIONS_DIR' environment variable.
+** `GUILE_EXTENSIONS_PATH' environment variable.
 
-FIXME
+See "Environment Variables" in the manual.
 
 ** `mkdtemp' and `mkstemp'
 
diff --git a/doc/ref/guile-invoke.texi b/doc/ref/guile-invoke.texi
index 42bbd35f3..ee5f23e50 100644
--- a/doc/ref/guile-invoke.texi
+++ b/doc/ref/guile-invoke.texi
@@ -1,6 +1,6 @@
 @c -*-texinfo-*-
 @c This is part of the GNU Guile Reference Manual.
-@c Copyright (C) 1996-1997,2000-2005,2010-2011,2013-2014,2016,2019
+@c Copyright (C) 1996-1997,2000-2005,2010-2011,2013-2014,2016,2019,2021
 @c   Free Software Foundation, Inc.
 @c See the file guile.texi for copying conditions.
 
@@ -400,6 +400,14 @@ guile -c '(display %load-path) (newline)'
 (Note: The line breaks, above, are for documentation purposes only, and
 not required in the actual example.)
 
+@item GUILE_EXTENSIONS_PATH
+@vindex GUILE_EXTENSIONS_PATH
+This variable may be used to augment the path that is searched for
+foreign libraries via @code{load-extension}, @code{dynamic-link},
+@code{load-foreign-library}, or the like.  Its value should be a
+colon-separated (semicolon on Windows) list of directories.
+@xref{Foreign Libraries}.
+
 @item GUILE_WARN_DEPRECATED
 @vindex GUILE_WARN_DEPRECATED
 As Guile evolves, some features will be eliminated or replaced by newer