diff --git a/docs/arguments.md b/docs/arguments.md
index d0e46ae..6ce1921 100644
--- a/docs/arguments.md
+++ b/docs/arguments.md
@@ -270,6 +270,7 @@ Environment Variable: WATCHTOWER_HTTP_API_UPDATE
 
 ## HTTP API Token
 Sets an authentication token to HTTP API requests.
+Can also reference a file, in which case the contents of the file are used.
 
 ```text
             Argument: --http-api-token
diff --git a/internal/flags/flags.go b/internal/flags/flags.go
index 95cd3ea..1195119 100644
--- a/internal/flags/flags.go
+++ b/internal/flags/flags.go
@@ -466,6 +466,7 @@ func GetSecretsFromFiles(rootCmd *cobra.Command) {
 		"notification-msteams-hook",
 		"notification-gotify-token",
 		"notification-url",
+		"http-api-token",
 	}
 	for _, secret := range secrets {
 		if err := getSecretFromFile(flags, secret); err != nil {