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+This error occurs because you tried to mutably borrow a non-mutable variable.
+
+Erroneous code example:
+
+```compile_fail,E0596
+let x = 1;
+let y = &mut x; // error: cannot borrow mutably
+```
+
+In here, `x` isn't mutable, so when we try to mutably borrow it in `y`, it
+fails. To fix this error, you need to make `x` mutable:
+
+```
+let mut x = 1;
+let y = &mut x; // ok!
+```