diff --git a/nvim/init.lua b/nvim/init.lua
index d48d117..35b9c51 100644
--- a/nvim/init.lua
+++ b/nvim/init.lua
@@ -828,6 +828,16 @@ require('lazy').setup({
       -- - sr)'  - [S]urround [R]eplace [)] [']
       require('mini.surround').setup()
 
+      -- Expand and collapse object definitions.
+      require('mini.splitjoin').setup {
+        mappings = {
+          -- Remove default mapping
+          toggle = '',
+        },
+
+        vim.keymap.set('n', 'gs', '<cmd>lua MiniSplitjoin.toggle()<CR>', { desc = '[S]plitjoin toggle' }),
+      }
+
       -- Startup dashboard
       require('mini.starter').setup {
         footer = '',