diff --git a/backend/app/cmd/server.go b/backend/app/cmd/server.go
index 32074f3e..519b2efb 100644
--- a/backend/app/cmd/server.go
+++ b/backend/app/cmd/server.go
@@ -74,7 +74,7 @@ type ServerCommand struct {
 	CriticalScore              int           `long:"critical-score" env:"CRITICAL_SCORE" default:"-10" description:"critical score threshold"`
 	PositiveScore              bool          `long:"positive-score" env:"POSITIVE_SCORE" description:"enable positive score only"`
 	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"`
+	EditDuration               time.Duration `long:"edit-time" env:"EDIT_TIME" default:"5m" description:"edit window; set to 0 to disable comment editing and staged image cleanup"`
 	AdminEdit                  bool          `long:"admin-edit" env:"ADMIN_EDIT" description:"unlimited edit for admins"`
 	Port                       int           `long:"port" env:"REMARK_PORT" default:"8080" description:"port"`
 	Address                    string        `long:"address" env:"REMARK_ADDRESS" default:"" description:"listening address"`
diff --git a/site/src/docs/configuration/parameters/index.md b/site/src/docs/configuration/parameters/index.md
index f6124cf8..7ad170b0 100644
--- a/site/src/docs/configuration/parameters/index.md
+++ b/site/src/docs/configuration/parameters/index.md
@@ -147,7 +147,7 @@ services:
 | positive-score                 | POSITIVE_SCORE                 | `false`                 | restricts comment's score to be only positive            |
 | restricted-words               | RESTRICTED_WORDS               |                         | words banned in comments (can use `*`), _multi_          |
 | restricted-names               | RESTRICTED_NAMES               |                         | names prohibited to use by the user, _multi_             |
-| edit-time                      | EDIT_TIME                      | `5m`                    | edit window                                              |
+| edit-time                      | EDIT_TIME                      | `5m`                    | edit window; set to `0` to disable comment editing and staged image cleanup |
 | admin-edit                     | ADMIN_EDIT                     | `false`                 | unlimited edit for admins                                |
 | read-age                       | READONLY_AGE                   |                         | read-only age of comments, days                          |
 | image-proxy.http2https         | IMAGE_PROXY_HTTP2HTTPS         | `false`                 | enable HTTP->HTTPS proxy for images                      |