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Update cpp-type-system-modern-cpp.md #4260

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2 changes: 1 addition & 1 deletion docs/cpp/cpp-type-system-modern-cpp.md
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Expand Up @@ -80,7 +80,7 @@ Any built-in or user-defined type may be qualified by the const keyword. Additio
```cpp

const double PI = 3.1415;
PI = .75 //Error. Cannot modify const variable.
PI = .75; //Error. Cannot modify const variable.
```

The **`const`** qualifier is used extensively in function and variable declarations and "const correctness" is an important concept in C++; essentially it means to use **`const`** to guarantee, at compile time, that values are not modified unintentionally. For more information, see [`const`](../cpp/const-cpp.md).
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