Origin shortcut key, and other hidden

Hello, I wonder why in menu Object->Transform there is no info about shortcut key next to the function name? I add for my convenience this four Origin functions to Snap menu, and there I see shortcut keys SHIFT+CTRL+ALT+C for “Set Origin” menu. The same is in Object Parent, for almost all I see CTRL+P, but I can not see ALT+P to last three options for remove parent. For faster learn Blender all shortcut keys should be visilbe in menus. Thanks