It looks like this text was duplicated (#477)

index.bs

@@ -328,10 +328,6 @@ Before adding items, consider integration with existing, similar capabilities.
 If this leads to a preferred design approach that cannot be implemented by only adding items,
 it might still be possible; see [[#removing-features]].
 
-Do not assume that a change or removal is impossible without first checking.
-Before adding items, consider integration with existing, similar capabilities.
-If this leads to a preferred design approach that cannot be implemented by only adding items,
-it might still be possible; see [[#removing-features]].
 Do not assume that a change or removal is impossible without first checking.
 
 <h3 id=removing-features>Remove or change capabilities only once you understand existing usage</h3>