diff --git a/.config/nvim/after/plugin/nvim-cmp.lua b/.config/nvim/after/plugin/nvim-cmp.lua
index ba4ca44..e6b5441 100644
--- a/.config/nvim/after/plugin/nvim-cmp.lua
+++ b/.config/nvim/after/plugin/nvim-cmp.lua
@@ -63,6 +63,7 @@ cmp.setup({
   }),
   sources = {
     { name = "copilot",  group_index = 2 },
+    { name = "zk" },
     { name = "nvim_lsp", keyword_length = 8 },
     { name = "luasnip",  max_item_count = 16 },
     { name = "path" },
diff --git a/.config/nvim/lua/zk/cmp.lua b/.config/nvim/lua/zk/cmp.lua
new file mode 100644
index 0000000..e3e234d
--- /dev/null
+++ b/.config/nvim/lua/zk/cmp.lua
@@ -0,0 +1,49 @@
+local cmp = require("cmp")
+
+local source = {}
+
+local function get_markdown_files(base)
+  local items = {}
+  local pattern = base .. "/**/*.md"
+  local files = vim.fn.glob(pattern, false, true)
+  for _, file in ipairs(files) do
+    local label = file:gsub("^%./", ""):gsub("%.md$", "")
+    table.insert(items, { label = label })
+  end
+  return items
+end
+
+function source:complete(params, callback)
+  local cursor_before_line = params.context.cursor_before_line
+  local cursor_after_line = params.context.cursor_after_line or ""
+
+  local trigger = cursor_before_line:match("%[[^%]]*%]%(([^)]*)$")
+
+  if trigger ~= nil then
+    local items = get_markdown_files(".")
+    local next_char = cursor_after_line:sub(1, 1)
+
+    for _, item in ipairs(items) do
+      if next_char == ")" then
+        item.insertText = item.label
+      else
+        item.insertText = item.label .. ")"
+      end
+    end
+
+    callback(items)
+  else
+    callback({})
+  end
+end
+
+function source:get_trigger_characters()
+  return { "(" }
+end
+
+function source:is_available()
+  local ft = vim.bo.filetype
+  return ft == "markdown" or ft == "pandoc"
+end
+
+cmp.register_source("zk", source)
diff --git a/.config/nvim/lua/zk.lua b/.config/nvim/lua/zk/init.lua
similarity index 98%
rename from .config/nvim/lua/zk.lua
rename to .config/nvim/lua/zk/init.lua
index dcd366d..bc81058 100644
--- a/.config/nvim/lua/zk.lua
+++ b/.config/nvim/lua/zk/init.lua
@@ -1,3 +1,5 @@
+require("zk.cmp")
+
 vim.cmd([[
 let s:zk_preview_enabled = 0
 let s:live_server_job = -1