diff --git a/src/CommandFormats.hh b/src/CommandFormats.hh
index 7097cef8..7877e580 100644
--- a/src/CommandFormats.hh
+++ b/src/CommandFormats.hh
@@ -888,24 +888,29 @@ struct SC_GameGuardCheck_BB_0022 {
 
 // 24 (S->C): Secret Lottery Ticket exchange result (BB)
 // Sent in response to a 6xDE command from the client.
+// The client sets 8 sequential quest registers, starting with start_reg_num,
+// to the values specified in reg_values. Then it starts a new quest thread
+// at the specified label.
 // header.flag indicates whether the client had any Secret Lottery Tickets in
 // their inventory (and hence could participate): 0 means success, 1 means
-// failure.
+// failure. However, this value is unused by the client.
 
 struct S_ExchangeSecretLotteryTicketResult_BB_24 {
   le_uint16_t label = 0;
-  uint8_t start_index = 0;
+  uint8_t start_reg_num = 0;
   uint8_t unused = 0;
-  parray<le_uint32_t, 8> unknown_a3;
+  parray<le_uint32_t, 8> reg_values;
 } __packed_ws__(S_ExchangeSecretLotteryTicketResult_BB_24, 0x24);
 
 // 25 (S->C): Gallon's Plan result (BB)
 // Sent in response to a 6xE1 command from the client.
+// The client sets the quest registers reg_num1 to reg_value1 and reg_num2 to
+// reg_value2, then starts a new quest thread at the specified label.
 
 struct S_GallonPlanResult_BB_25 {
   le_uint16_t label = 0;
-  uint8_t offset1 = 0;
-  uint8_t offset2 = 0;
+  uint8_t reg_num1 = 0;
+  uint8_t reg_num2 = 0;
   uint8_t value1 = 0;
   uint8_t value2 = 0;
   le_uint16_t unused = 0;
diff --git a/src/ReceiveSubcommands.cc b/src/ReceiveSubcommands.cc
index 3ccf4fe6..fdef78c6 100644
--- a/src/ReceiveSubcommands.cc
+++ b/src/ReceiveSubcommands.cc
@@ -4765,15 +4765,15 @@ static void on_secret_lottery_ticket_exchange_bb(shared_ptr<Client> c, uint8_t,
   }
 
   S_ExchangeSecretLotteryTicketResult_BB_24 out_cmd;
-  out_cmd.start_index = cmd.index;
+  out_cmd.start_reg_num = cmd.index;
   out_cmd.label = cmd.success_label;
   if (s->secret_lottery_results.empty()) {
-    out_cmd.unknown_a3.clear(0);
+    out_cmd.reg_values.clear(0);
   } else if (s->secret_lottery_results.size() == 1) {
-    out_cmd.unknown_a3.clear(1);
+    out_cmd.reg_values.clear(1);
   } else {
-    for (size_t z = 0; z < out_cmd.unknown_a3.size(); z++) {
-      out_cmd.unknown_a3[z] = random_from_optional_crypt(l->opt_rand_crypt) % s->secret_lottery_results.size();
+    for (size_t z = 0; z < out_cmd.reg_values.size(); z++) {
+      out_cmd.reg_values[z] = random_from_optional_crypt(l->opt_rand_crypt) % s->secret_lottery_results.size();
     }
   }
   send_command_t(c, 0x24, (slt_index >= 0) ? 0 : 1, out_cmd);
@@ -4883,8 +4883,8 @@ static void on_quest_F95F_result_bb(shared_ptr<Client> c, uint8_t, uint8_t, void
 
   S_GallonPlanResult_BB_25 out_cmd;
   out_cmd.label = cmd.success_label;
-  out_cmd.offset1 = 0x3C;
-  out_cmd.offset2 = 0x08;
+  out_cmd.reg_num1 = 0x3C;
+  out_cmd.reg_num2 = 0x08;
   out_cmd.value1 = 0x00;
   out_cmd.value2 = cmd.result_index;
   send_command_t(c, 0x25, 0x00, out_cmd);