Update requirements/index.html

requirements/index.html

@@ -129,7 +129,7 @@ <h4>Maintenance</h4>
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 							<strong>Governance</strong>: Utilize tools that allow interested parties to predict when issues important to them are being discussed. Maintain a backlog that reflects issues along with their status. </li>
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-							<strong>Backwards compatibility</strong> The WCAG 3 guidelines will take a cautious approach to backwards compatibility.  After the first publication of WCAG 3 guidance and conformance model the guidelines aim to be backwards compatible. However, it will not be bound to backwards compatibility if a better, more accessible outcome can be achieved. Where there are backwards-incompatible changes, the changes will be included in the publication materials so that users of the guidelines know exactly what has changed.
+							<strong>Backwards compatibility</strong> The WCAG 3 guidelines will take a cautious approach to backwards compatibility to early versions of WCAG 3.  After the first publication of WCAG 3 guidance and conformance model the guidelines aim to be backwards compatible. However, it will not be bound to backwards compatibility if a substantially more accessible outcome can be achieved. Where there are backwards-incompatible changes, the changes will be highlighted in the supplementary materials so that users of the guidelines know exactly what has changed.
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