diff --git a/src/aio.c b/src/aio.c
index be4df92..a1cc193 100644
--- a/src/aio.c
+++ b/src/aio.c
@@ -5,7 +5,8 @@
 
 static const uint8_t buf_size = 32; // needs 32 bc of overflow issue on these aios?
 
-#define POST_AND_GET_RESP(_req, resp_len) uint8_t req = _req; uint8_t resp[32]; aio_post(aio, &req, 1, resp, resp_len);
+// posts cmd to the aio, puts n bytes of response inside resp buffer
+#define POST_AND_GET_RESP(cmd, n) uint8_t req = cmd; uint8_t resp[32]; aio_post(aio, &req, 1, resp, n)
 
 static void aio_post(libusb_device_handle *dev, uint8_t *req, const int req_len, uint8_t *resp, const int resp_len) {
 	libusb_bulk_transfer(dev, 0x01, req, req_len, NULL, 1000);