diff --git a/README.md b/README.md
index 0130eb27..478b55b2 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,7 @@ _this is the recommended way to run remark42_
 | low-score               | LOW_SCORE               | `-5`                  | low score threshold                              |
 | critical-score          | CRITICAL_SCORE          | `-10`                 | critical score threshold                         |
 | edit-time               | EDIT_TIME               | `5m`                  | edit window                                      |
+| read-age                | READONLY_AGE            |                       | read-only age of comments, days                  |
 | img-proxy               | IMG_PROXY               | `false`               | enable http->https proxy for images              |
 | dbg                     | DEBUG                   | `false`               | debug mode                                       |
 | dev-passwd              | DEV_PASSWD              |                       | password for `dev` user                          |
diff --git a/backend/app/cmd/server.go b/backend/app/cmd/server.go
index 9808a630..77f980f7 100644
--- a/backend/app/cmd/server.go
+++ b/backend/app/cmd/server.go
@@ -48,7 +48,7 @@ type ServerCommand struct {
 	MaxVotes       int           `long:"max-votes" env:"MAX_VOTES" default:"-1" description:"maximum number of votes per comment"`
 	LowScore       int           `long:"low-score" env:"LOW_SCORE" default:"-5" description:"low score threshold"`
 	CriticalScore  int           `long:"critical-score" env:"CRITICAL_SCORE" default:"-10" description:"critical score threshold"`
-	ReadOnlyAge    int           `long:"read-age" env:"READONLY_AGE" default:"0" description:"read-only age of comments"`
+	ReadOnlyAge    int           `long:"read-age" env:"READONLY_AGE" default:"0" description:"read-only age of comments, days"`
 	EditDuration   time.Duration `long:"edit-time" env:"EDIT_TIME" default:"5m" description:"edit window"`
 	Port           int           `long:"port" env:"REMARK_PORT" default:"8080" description:"port"`
 	WebRoot        string        `long:"web-root" env:"REMARK_WEB_ROOT" default:"./web" description:"web root directory"`