diff --git a/src/saveload/cargopacket_sl.cpp b/src/saveload/cargopacket_sl.cpp
--- a/src/saveload/cargopacket_sl.cpp
+++ b/src/saveload/cargopacket_sl.cpp
@@ -15,6 +15,9 @@
 
 #include "saveload.h"
 
+/**
+ * Savegame conversion for cargopackets.
+ */
 /* static */ void CargoPacket::AfterLoad()
 {
 	if (IsSavegameVersionBefore(44)) {
@@ -101,6 +104,9 @@ const SaveLoad *GetCargoPacketDesc()
 	return _cargopacket_desc;
 }
 
+/**
+ * Save the cargo packets.
+ */
 static void Save_CAPA()
 {
 	CargoPacket *cp;
@@ -111,6 +117,9 @@ static void Save_CAPA()
 	}
 }
 
+/**
+ * Load the cargo packets.
+ */
 static void Load_CAPA()
 {
 	int index;
@@ -121,6 +130,7 @@ static void Load_CAPA()
 	}
 }
 
+/** Chunk handlers related to cargo packets. */
 extern const ChunkHandler _cargopacket_chunk_handlers[] = {
 	{ 'CAPA', Save_CAPA, Load_CAPA, NULL, NULL, CH_ARRAY | CH_LAST},
 };