The whole reason for the Amendment process is to allow for changes, even to the core of the Constitution and previous amendments.
For example, the 14th amendment said voters should be male and 21 or older.
The 15th amendment clarified that they could be any race.
The 19th amendment said that now they could be women.
The 24th clarified no poll tax could be collected.
..and the 26th amendment changed the voting age to 18, taking into consideration the fact majority of soldiers dying in service were unable to vote.
In some cases, amendments clarify existing assumptions or make new rules. In other cases, the amendments changed previous rules.
Here is a partial list of recently proposed amendments. Some of these amendments actually restrict existing rights (or the courts interpretation of these rights), while most expand rights.
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Exercise your rights and remember your obligations - VOTE!
I have always believed that hope is that stubborn thing inside us that insists, despite all the evidence to the contrary, that something better awaits us so long as we have the courage to keep reaching, to keep working, to keep fighting. --
Barack Hussein Obama