* src/main.c: Add help text for --retry-on-http-error

Reported-by: Giovanni Tirloni

src/main.c

@@ -636,6 +636,8 @@ Download:\n"),
   -t,  --tries=NUMBER              set number of retries to NUMBER (0 unlimits)\n"),
     N_("\
        --retry-connrefused         retry even if connection is refused\n"),
+    N_("\
+       --retry-on-http-error=ERRORS    comma-separated list of HTTP errors to retry\n"),
     N_("\
   -O,  --output-document=FILE      write documents to FILE\n"),
     N_("\