diff --git a/modules/projects/siren-projectile.el b/modules/projects/siren-projectile.el
index d824b89..89e855f 100644
--- a/modules/projects/siren-projectile.el
+++ b/modules/projects/siren-projectile.el
@@ -57,6 +57,22 @@
   ;; separate projects.
   (push "Gemfile" projectile-project-root-files-bottom-up)
 
+  ;; Customize marginalia if loaded.
+  (with-eval-after-load 'marginalia
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-switch-project . file))
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-switch-open-project . file))
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-find-file . project-file))
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-recentf . project-file))
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-display-buffer . project-buffer))
+    (add-to-list 'marginalia-command-categories
+                 '(projectile-switch-to-buffer . project-buffer)))
+
+  ;; Enable projectile.
   (projectile-mode))
 
 (provide 'siren-projectile)