diff --git a/libnfc/nfc.c b/libnfc/nfc.c
index 541e466..fd1300d 100644
--- a/libnfc/nfc.c
+++ b/libnfc/nfc.c
@@ -525,6 +525,9 @@ nfc_initiator_poll_target(nfc_device *pnd,
  * to passive communications.
  *
  * @note \a nfc_dep_info will be returned when the target was acquired successfully.
+ *
+ * If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
+ * If timeout equals to -1, the default timeout will be used
  */
 int
 nfc_initiator_select_dep_target(nfc_device *pnd,
@@ -607,9 +610,6 @@ nfc_initiator_deselect_target(nfc_device *pnd)
  * The NFC device (configured as initiator) will transmit the supplied bytes (\a pbtTx) to the target.
  * It waits for the response and stores the received bytes in the \a pbtRx byte array.
  *
- * If timeout is not a null pointer, it specifies the maximum interval to wait for the function to be executed.
- * If timeout is a null pointer, the function blocks indefinitely (until an error is raised or function is completed).
- *
  * If \a NP_EASY_FRAMING option is disabled the frames will sent and received in raw mode: \e PN53x will not handle input neither output data.
  *
  * The parity bits are handled by the \e PN53x chip. The CRC can be generated automatically or handled manually.
@@ -621,6 +621,8 @@ nfc_initiator_deselect_target(nfc_device *pnd)
  *
  * @note When used with MIFARE Classic, NFC_EMFCAUTHFAIL error is returned if authentication command failed. You need to re-select the tag to operate with.
  *
+ * If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
+ * If timeout equals to -1, the default timeout will be used
  */
 int
 nfc_initiator_transceive_bytes(nfc_device *pnd, const uint8_t *pbtTx, const size_t szTx, uint8_t *pbtRx,
@@ -785,6 +787,9 @@ nfc_initiator_transceive_bits_timed(nfc_device *pnd,
  * received that is not part of the anti-collision. The RATS command for
  * example would wake up the emulator. After this is received, the send and
  * receive functions can be used.
+ *
+ * If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
+ * If timeout equals to -1, the default timeout will be used
  */
 int
 nfc_target_init(nfc_device *pnd, nfc_target *pnt, uint8_t *pbtRx, const size_t szRx, int timeout)
@@ -862,8 +867,8 @@ nfc_abort_command(nfc_device *pnd)
  * This function make the NFC device (configured as \e target) send byte frames
  * (e.g. APDU responses) to the \e initiator.
  *
- * If timeout is not a null pointer, it specifies the maximum interval to wait for the function to be executed.
- * If timeout is a null pointer, the function blocks indefinitely (until an error is raised or function is completed).
+ * If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
+ * If timeout equals to -1, the default timeout will be used
  */
 int
 nfc_target_send_bytes(nfc_device *pnd, const uint8_t *pbtTx, const size_t szTx, int timeout)