diff --git a/clang-tools-extra/docs/clangd/SimpleExample.rst b/clang-tools-extra/docs/clangd/SimpleExample.rst
new file mode 100644
--- /dev/null
+++ b/clang-tools-extra/docs/clangd/SimpleExample.rst
@@ -0,0 +1,110 @@
+=====================
+Simple example clangd
+=====================
+
+clangd is not designed to be used in command line.
+However, we are providing this example to show how it works.
+
+The following file (ex: commands.json) represents a list of commands
+to get a completion suggestion.
+
+.. code-block:: json
+
+   {
+     "jsonrpc": "2.0",
+     "id": 0,
+     "method": "initialize",
+     "params": {
+       "capabilities": {
+         "textDocument": {
+           "completion": {
+             "completionItem": {
+               "snippetSupport": true
+             }
+           }
+         }
+       },
+       "trace": "off"
+     }
+   }
+   ---
+   {
+       "jsonrpc": "2.0",
+       "method": "textDocument/didOpen",
+       "params": {
+           "textDocument": {
+               "uri": "test:///main.cpp",
+               "languageId": "cpp",
+               "version": 1,
+               "text": "int func_with_args(int a, int b);\nint main() {\nfunc_with\n}"
+           }
+       }
+   }
+   ---
+   {
+       "jsonrpc": "2.0",
+       "id": 1,
+       "method": "textDocument/completion",
+       "params": {
+           "textDocument": {
+               "uri": "test:///main.cpp"
+           },
+           "position": {
+               "line": 2,
+               "character": 7
+            }
+        }
+   }
+   ---
+   {
+       "jsonrpc": "2.0",
+       "id": 4,
+       "method": "shutdown"
+   }
+   ---
+   {
+       "jsonrpc": "2.0",
+       "method": "exit"
+   }
+
+
+To run all the commands at once:
+
+.. code-block:: shell
+
+   clangd -lit-test < commands.json
+
+This example will try to get the completion on line 2, column 7.
+Here is a subset of the returned information:
+
+.. code-block:: json
+
+    [...]
+    "items": [
+      {
+        "detail": "int",
+        "filterText": "func_with_args",
+        "insertText": "func_with_args(${1:int a}, ${2:int b})",
+        "insertTextFormat": 2,
+        "kind": 3,
+        "label": " func_with_args(int a, int b)",
+        "score": 9.9000005722045898,
+        "sortText": "3ee19999func_with_args",
+        "textEdit": {
+          "newText": "func_with_args(${1:int a}, ${2:int b})",
+          "range": {
+            "end": {
+              "character": 7,
+              "line": 2
+            },
+            "start": {
+              "character": 0,
+              "line": 2
+            }
+          }
+        }
+      }
+    [...]
+
+`newText` shows that clangd is able to find a suggestion for the completion and
+where to insert it.
diff --git a/clang-tools-extra/docs/clangd/index.rst b/clang-tools-extra/docs/clangd/index.rst
--- a/clang-tools-extra/docs/clangd/index.rst
+++ b/clang-tools-extra/docs/clangd/index.rst
@@ -8,6 +8,7 @@
    Installation
    Features
    Configuration
+   SimpleExample
 
 What is clangd?
 ===============