See the diff:
--- src/option.c (revision 1038) +++ src/option.c (working copy) @@ -141,7 +141,7 @@ { "maximized", 0, 0, G_OPTION_ARG_NONE, &options.data.maximized, N_("Set window maximized"), NULL }, { "fullscreen", 0, 0, G_OPTION_ARG_NONE, &options.data.fullscreen, - N_("Set window fulscreen"), NULL }, + N_("Set window fullscreen"), NULL }, { "no-focus", 0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &options.data.focus, N_("Don't focus dialog window"), NULL }, { "close-on-unfocus", 0, 0, G_OPTION_ARG_NONE, &options.data.close_on_unfocus,