diff --git a/elisp/extensions.bzl b/elisp/extensions.bzl
index 0831e444..14147769 100644
--- a/elisp/extensions.bzl
+++ b/elisp/extensions.bzl
@@ -12,7 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Module extensions for Emacs Lisp."""
+"""Module extensions for Emacs Lisp.
+
+This file is deprecated; use //elisp/extensions:elisp.bzl instead."""
 
 load("//elisp/extensions:elisp.bzl", _elisp = "elisp")