Update global@oC4o6GLEES_nUgCJu9Q6I.md (#6683)

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>

src/data/roadmaps/javascript/content/global@oC4o6GLEES_nUgCJu9Q6I.md

@@ -2,6 +2,11 @@
 
 Variables declared Globally (outside any function) have Global Scope. Global variables can be accessed from anywhere in a JavaScript program. Variables declared with `var`, `let` and `const` are quite similar when declared outside a block.
 
+### Note:
+
+If you assign a value to a variable  that has not been declared i.e `potato = true` 
+it will automatically become a _GLOBAL_ variable.
+
 Visit the following resources to learn more:
 
 - [@article@JavaScript Scope](https://www.w3schools.com/js/js_scope.asp)