iwlwifi: Document Rx calibration

Document Rx calibration

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 7d95de9d0..d44166a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -1068,6 +1068,7 @@
 			data->auto_corr_cck, data->auto_corr_cck_mrc,
 			data->nrg_th_cck);
 
+	/* Update uCode's "work" table, and copy it to DSP */
 	cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 
 	if (flags & CMD_ASYNC)