diff --git a/README.md b/README.md
index abbfcf6..531e26b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,8 @@ Starting with version `2.0.0`, the `ef-themes` are built on top of the
 `modus-themes`. This means that all customisation options of the Modus
 themes apply to the Ef themes. Same for all Modus commands that load a
 theme. Enable `ef-themes-take-over-modus-themes-mode` to set up this
-arrangement.
+arrangement (or enable `modus-themes-include-derivatives-mode` instead
+to blend Ef and Modus into one collection).
 
 + Package name (GNU ELPA): `ef-themes`
 + Official manual: <https://protesilaos.com/emacs/ef-themes>
diff --git a/README.org b/README.org
index d24b9d4..58b436c 100644
--- a/README.org
+++ b/README.org
@@ -127,7 +127,8 @@ As part of {{{development-version}}}, the ~ef-themes~ are built on top
 of the ~modus-themes~. This means that all customisation is done via
 the Modus user options. Furthermore, all theme-loading commands are
 those of Modus, provided the ~ef-themes-take-over-modus-themes-mode~
-is enabled.
+is enabled (or enable ~modus-themes-include-derivatives-mode~ instead
+to blend Ef and Modus into one collection).
 
 #+begin_src emacs-lisp
 (use-package ef-themes