Adding concrete to top of spa wall

Foo Fighters

LifeTime Supporter
Nov 6, 2011
17
Southern Nevada
Having an entire remodel done and they suggested adding concrete to top of spa wall to bring it up even with the deck elevation. This will be an approximately 4" tall and 7" wide addition. Should they be using some fiberglass rebar at the top or to side of the existing wall to help secure or is that even possible? I'm concerned about just having a floating piece of concrete there without any mechanical adhesion. I believe they plan on building the form and pouring without any rebar.
 

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I would want some rebar dowels epoxied into holes in the bond beam to connect the new and old structures.
 
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