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@@ -387,11 +387,12 @@ jsr read_controller_x
```
Reading from one controller or the other is the same but the `x` register can be
-used to select which controller to read. Similarly, use the `x` or the `y`
-registers as a "select" for the function's code. This pattern can also be
-reproduced in functions that perform bank switching, for example, as a way to
-index the bank to be selected. This can be further documented by adding a suffix
-into the function's name, as it's done in the above example.
+used to select which controller to read. In general, this is a pattern in which
+the `x` or the `y` registers are used as a "select" for the function's code.
+This pattern can also be reproduced in functions that perform bank switching,
+for example, as a way to index the bank to be selected. This can be further
+documented by adding a suffix into the function's name, as it's done in the
+above example.
## Memory arguments first, optimize with registers later