Update README.md

README.md

@@ -5,5 +5,31 @@ nvim-cmp source for neovim builtin LSP client
 
 ```lua
 require('cmp_nvim_lsp').setup {}
+
+
+-- The nvim-cmp almost supports LSP's capabilities so You should advertise it to LSP servers..
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities.textDocument.completion.completionItem.documentationFormat = { 'markdown' }
+capabilities.textDocument.completion.completionItem.snippetSupport = true
+capabilities.textDocument.completion.completionItem.preselectSupport = true
+capabilities.textDocument.completion.completionItem.insertReplaceSupport = true
+capabilities.textDocument.completion.completionItem.labelDetailsSupport = true
+capabilities.textDocument.completion.completionItem.deprecatedSupport = true
+capabilities.textDocument.completion.completionItem.commitCharactersSupport = true
+capabilities.textDocument.completion.completionItem.tagSupport = { valueSet = { 1 } }
+capabilities.textDocument.completion.completionItem.resolveSupport = {
+  properties = {
+    'documentation',
+    'detail',
+    'additionalTextEdits',
+  }
+}
+
+-- The following example advertise capabilities to `clangd`.
+require'lspconfig'.clangd.setup {
+  capabilities = capabilities,
+}
 ```
 
+
+