diff --git a/init.lua b/init.lua
index e69de29..e4373f7 100644
--- a/init.lua
+++ b/init.lua
@@ -0,0 +1,11 @@
+local function split_sentences()
+    local view = vim.fn.winsaveview() -- keep cursor & view stable
+    vim.cmd([[%s/\([.?!]\)\s\+/\1\r/ge]])
+    vim.fn.winrestview(view)
+end
+
+-- run after leaving insert mode
+vim.api.nvim_create_autocmd({ "InsertLeave", "TextChanged" }, {
+    pattern = { "*.md", "*.txt" },
+    callback = split_sentences
+})