diff --git a/default.nix b/default.nix
index 39169ed..92198b8 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,14 @@
 { # The files would be going to ~/.config/doom (~/.doom.d)
   doomPrivateDir
+  /* Extra packages to install
+
+     Useful for non-emacs packages containing emacs bindings (e.g.
+     mu4e).
+
+     Example:
+       extraPackages = epkgs: [ pkgs.mu ];
+  */
+, extraPackages ? epkgs: []
   /* Package set to install emacs and dependent packages from
 
      Only used to get emacs package, if `bundledPackages` is set.
@@ -85,6 +94,7 @@ let
             in epkgs.overrideScope' overrides
           else
             emacsPackages.overrideScope' overrides;
+        emacs = emacsPackages.emacsWithPackages extraPackages;
         emacsLoadFiles = [ ./advice.el ];
         emacsArgs = [
           "--"
diff --git a/derivations.json b/derivations.json
index af276f9..7ef74df 100644
--- a/derivations.json
+++ b/derivations.json
@@ -7,7 +7,7 @@
     "nix-straight.el": {
         "owner": "vlaci",
         "repo": "nix-straight.el",
-        "rev": "v1.0"
+        "rev": "v1.1.0"
     },
     "org-yt": {
         "owner": "TobiasZawada",
diff --git a/derivations.lock b/derivations.lock
index 83ee68b..53e8884 100644
--- a/derivations.lock
+++ b/derivations.lock
@@ -17,12 +17,12 @@
         "args": {
             "owner": "vlaci",
             "repo": "nix-straight.el",
-            "rev": "6182914aefea06ef514cd3f3f7f9f67db45940db",
-            "sha256": "038dss49bfvpj15psh5pr9jyavivninl0rzga9cn8qyc4g2cj5i0"
+            "rev": "ed6b14fc7a4f391229e74d5a8828a351798dda27",
+            "sha256": "0rmpvz2c2f4vdk8xdk0xqdr3pzxqfimwch4ri7cyyzqc327bd0m8"
         },
         "meta": {
-            "updated": "2019-10-25T22:28:25+00:00",
-            "rev": "6182914aefea06ef514cd3f3f7f9f67db45940db"
+            "updated": "2019-11-22T19:53:27+00:00",
+            "rev": "ed6b14fc7a4f391229e74d5a8828a351798dda27"
         }
     },
     "org-yt": {