This summary is not the rule. The rule text controls.
If someone gets hurt and the person or company responsible later fixes the problem or makes changes to prevent it from happening again, that fix generally can't be used as evidence against them in court. For example, if a store puts up a new warning sign after someone slips and falls, the injured person usually can't point to that new sign to prove the store was careless or that the product or property was unsafe before.
The reason for this rule is simple. Courts want to encourage people and companies to fix dangerous conditions without fear that doing the right thing will be used against them later. If people knew that making repairs could hurt them in a lawsuit, they might be less likely to fix safety problems at all.
However, this evidence can still be used for other reasons. For example, if the company denies that they owned or controlled the property where the injury happened, evidence of the fix could help prove that they did. It can also be used to challenge a witness's credibility, or to show that a safety fix was actually possible if the other side claims it wasn't. So while the rule blocks this evidence for proving fault, it still allows it in certain other situations.
