Index: cackey.c
==================================================================
--- cackey.c
+++ cackey.c
@@ -1007,12 +1007,14 @@
  *         number of bytes written to the buffer.  If this is specified as
  *         NULL, it will not be updated, and "respdata" will be ignored causing
  *         the response data to be discarded.
  *
  * RETURN VALUE
- *     CACKEY_PCSC_S_OK         On success
- *     CACKEY_PCSC_E_GENERIC    On error
+ *     CACKEY_PCSC_S_OK           On success
+ *     CACKEY_PCSC_E_GENERIC      On error
+ *     CACKEY_PCSC_E_TOKENABSENT  If the sending failed because the token is
+ *                                absent
  *
  * NOTES
  *     This function will connect to the PC/SC Connection Manager via
  *     cackey_pcsc_connect() if needed.
  *