diff --git a/firmware/fw_dynamic.S b/firmware/fw_dynamic.S
index ba9394da..192698a0 100644
--- a/firmware/fw_dynamic.S
+++ b/firmware/fw_dynamic.S
@@ -91,6 +91,8 @@ fw_save_info:
 	.global fw_prev_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The previous arg1 should be returned in 'a0'.
 	 */
 fw_prev_arg1:
@@ -102,6 +104,8 @@ fw_prev_arg1:
 	.global fw_next_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The next arg1 should be returned in 'a0'.
 	 */
 fw_next_arg1:
diff --git a/firmware/fw_jump.S b/firmware/fw_jump.S
index 0015a808..e0a3b538 100644
--- a/firmware/fw_jump.S
+++ b/firmware/fw_jump.S
@@ -39,6 +39,8 @@ fw_save_info:
 	.global fw_prev_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The previous arg1 should be returned in 'a0'.
 	 */
 fw_prev_arg1:
@@ -50,6 +52,8 @@ fw_prev_arg1:
 	.global fw_next_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The next arg1 should be returned in 'a0'.
 	 */
 fw_next_arg1:
diff --git a/firmware/fw_payload.S b/firmware/fw_payload.S
index b9cb151b..84d9ad4b 100644
--- a/firmware/fw_payload.S
+++ b/firmware/fw_payload.S
@@ -39,6 +39,8 @@ fw_save_info:
 	.global fw_prev_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The previous arg1 should be returned in 'a0'.
 	 */
 fw_prev_arg1:
@@ -54,6 +56,8 @@ fw_prev_arg1:
 	.global fw_next_arg1
 	/*
 	 * We can only use a0, a1, and a2 registers here.
+	 * The a0, a1, and a2 registers will be same as passed by
+	 * previous booting stage.
 	 * The next arg1 should be returned in 'a0'.
 	 */
 fw_next_arg1: