Readme.md

@@ -85,7 +85,9 @@ set, `afatfs_poll()` will be called internally from the callback function provid
 
 It is **strongly recommended** that `sdcard_readBlock()` and `sdcard_writeBlock()` implement some kind of scheduling
 and never call the provided callback directly. Since the callback functions themselves will call `afatfs_poll()`
-internally (in this mode), another call to any of the SD card primitives could be triggered. This will lead to
+internally (in this mode), another call to any of the SD card primitives might be triggered. This will lead to
 AsyncFatFS performing an unbounded amount of work (particularly at card init when writing the freefile) and using an
 unbounded amount of stack size. If you have an infinite stack, then please go ahead. If not, then make sure that you
 use the callbacks further up the stack, e.g. from your main loop.
+
+Similarly, it is important that you update any internal state variables *before* you use any callback.