diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b1dacd7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,24 @@
+# slack-stream-json
+
+Prints Slack's [Real Time Messaging](https://api.slack.com/rtm) (RTM) API streams to stdout.
+
+## Usage
+
+Set `SLACK_TOKEN` environment variable to a token for RTM API, for example obtained from [Legacy Tokens](https://api.slack.com/custom-integrations/legacy-tokens]) page. Once invoked, slack-stream-json prints RTM event JSON line by line.
+
+    slack-stream-json 0.1.0
+
+    USAGE:
+        slack-stream-json [FLAGS]
+
+    FLAGS:
+        -f, --format-message          Resolve Slack message format, including mentions and links
+        -h, --help                    Prints help information
+        -i, --inflate-fields          Inflate "user", "channel" ID fields to corresponding JSON objects
+        -p, --print-start-response    Print rtm.start response JSON before starting RTM stream
+        -V, --version                 Prints version information
+
+## Install
+
+* Download binaries from [Releases](https://github.com/motemen/slack-stream-json/releases), or
+* Clone this repository and install by `cargo install`.
diff --git a/src/main.rs b/src/main.rs
index 6854298..de8029b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -86,7 +86,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         let message = websocket.read_message()?;
 
         if let tungstenite::Message::Text(text) = message {
-            // TODO: handle events like "channel_created" to update id_to_object
+            // TODO: handle events like "team_join", channel_created" to update id_to_object
             // TODO: handle "goodbye" event
             let mut v: JSONValue = serde_json::from_str(&text)?;
             if opt.inflate_fields {