Point out that x-init and x-data can't be "spread"

README.md

@@ -612,7 +612,9 @@ These behave exactly like VueJs's transition directives, except they have differ
 
 The object keys are the directives (Can be any directive including modifiers), and the values are callbacks to be evaluated by Alpine.
 
-> Note: The only anomaly with x-spread is when used with `x-for`. When the directive being "spread" is `x-for`, you should return a normal expression string from the callback. For example: `['x-for']() { return 'item in items' }`.
+> Note: There are a couple of caveats to x-spread:
+> - When the directive being "spread" is `x-for`, you should return a normal expression string from the callback. For example: `['x-for']() { return 'item in items' }`.
+> - `x-data` and `x-init` can't be used inside a "spread" object
 
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