Indicate that title is required. Punctuation.

yo/YoCommandLine.swift

@@ -15,8 +15,8 @@ class YoCommandLine {
     let banner = BoolOption(shortFlag: "m", longFlag: "banner-mode", helpMessage: "Does not work! Set if you would like to send a non-persistent notification. No buttons will be available if set.")
     let ignoresDoNotDisturb = BoolOption(shortFlag: "d", longFlag: "ignores-do-not-disturb", helpMessage: "Set to make your notification appear even if computer is in do-not-disturb mode.")
     let lockscreenOnly = BoolOption(shortFlag: "l", longFlag: "lockscreen-only", helpMessage: "Set to make your notification appear only if computer is locked. If set, no buttons will be available.")
-    let title = StringOption(shortFlag: "t", longFlag: "title", required: true, helpMessage: "Title for notification")
-    let subtitle = StringOption(shortFlag: "s", longFlag: "subtitle", required: false, helpMessage: "Subtitle for notification")
+    let title = StringOption(shortFlag: "t", longFlag: "title", required: true, helpMessage: "Title for notification. REQUIRED.")
+    let subtitle = StringOption(shortFlag: "s", longFlag: "subtitle", required: false, helpMessage: "Subtitle for notification.")
     let informativeText = StringOption(shortFlag: "n", longFlag: "info", required: false, helpMessage: "Informative text.")
     let actionBtnText = StringOption(shortFlag: "b", longFlag: "action-btn", required: false, helpMessage: "Include an action button, with the button label text supplied to this argument.")
     let otherBtnText = StringOption(shortFlag: "o", longFlag: "other-btn", required: false, helpMessage: "Alternate label for cancel button text.")