nvim: cmp: signature help

.config/nvim/lua/my/completion.lua

@@ -15,6 +15,7 @@ packer.use {
             requires = 'https://github.com/L3MON4D3/LuaSnip'
         },
         'https://github.com/hrsh7th/cmp-nvim-lua',
+        'https://github.com/hrsh7th/cmp-nvim-lsp-signature-help'
     },
     config = function()
         local cmp = require'cmp'
@@ -64,6 +65,7 @@ packer.use {
             sources = cmp.config.sources({
                 { name = 'nvim_lsp' },
                 { name = 'luasnip' },
+                { name = 'nvim_lsp_signature_help' },
             }, {
                 { name = 'buffer' },
             })