diff --git a/CONFIG.md b/CONFIG.md
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+++ b/CONFIG.md
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+# config.json format
+
+This document describes the field in config.json.
+
+Create config.json by running:
+
+`cp example.config.json config.json`
+
+in the project folder, then edit it.
+
+## "master"
+
+`number|string`
+
+Master admin ID as a number or username as a string.
+
+## "token"
+
+`string`
+
+Telegram Bot token obtained from [https://t.me/BotFather](@BotFather).
+
+## "plugins"
+
+`[string]`
+
+List of plugin names to be loaded.
+
+## "deleteCommands"
+
+`string`
+
+Which messages with commands should be deleted?
+
+Options:
+
+* "all"
+* "own" (default) - leave commands meant for other bots
+* "none"
+
+## "numberOfWarnsToBan"
+
+`number`
+
+Number of warns that will get someone banned.
+
+## "groupsInlineKeyboard"
+
+`[[inlineButton]]`
+
+inline keyboard to be added to reply to /groups.
+
+## "warnInlineKeyboard"
+
+`[[inlineButton]]`
+
+Inline keyboard to be added to warn message.
+
+## "excludedChannels"
+
+`[string]`
+
+List of channels that you want to be excluded from automatic warns.
+
+Use `"*"` to disable.
+
+## "excludedGroups"
+
+`[string]`
+
+List of groups that you want to be excluded from automatic warns.
+
+Use `"*"` to disable.
+
diff --git a/config.example.json b/config.example.json
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--- a/config.example.json
+++ /dev/null
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-{
-	"master": 123456789, // master admin ID as a number or username as astring.
-	"token": "", // bot token.
-	"plugins": [], // list of plugin names to be loaded
-
-	"deleteCommands": "own", // which messages with commands should be deleted?
-		// valid options: "all", "own" (leave commands meant for other bots, this is the default), "none".
-
-	"numberOfWarnsToBan": 3, // Number of warns that will get someone banned.
-	"groupsInlineKeyboard": [], // [[inlineButton]] -> inline keyboard to be added to reply to /groups
-	"warnInlineKeyboard": [], // [[inlineButton]] -> inline keyboard to be added to warn message
-
-	// [String] -> list of channels or groups links/usernames that you want to be excluded from warnings
-	//  use "*" to disable this feature.
-	"excludedChannels": [],
-	"excludedGroups": []
-}
diff --git a/example.config.json b/example.config.json
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+++ b/example.config.json
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+{
+	"master": 123456789,
+	"token": "",
+	"plugins": [],
+	"deleteCommands": "own",
+	"numberOfWarnsToBan": 3,
+	"groupsInlineKeyboard": [],
+	"warnInlineKeyboard": [],
+	"excludedChannels": [],
+	"excludedGroups": []
+}