diff --git a/include/land.h b/include/land.h
index b567dcad..35f288bb 100644
--- a/include/land.h
+++ b/include/land.h
@@ -61,7 +61,7 @@ struct lndstr {
     coord lnd_opx, lnd_opy;	/* Op sector coords */
     short lnd_mission;		/* mission code */
     short lnd_radius;		/* mission radius */
-    s_char lnd_flags;		/* unit flags */
+    s_char lnd_flags;		/* unit flags (unused) */
     short lnd_ship;		/* pointer to transporting ship */
     s_char lnd_harden;		/* for missiles */
     short lnd_retreat;		/* retreat percentage */
diff --git a/include/lost.h b/include/lost.h
index adfec5bc..27e135d3 100644
--- a/include/lost.h
+++ b/include/lost.h
@@ -36,9 +36,9 @@
 struct loststr {
     short ef_type;
     natid lost_owner;		/* Who lost it */
-    int lost_uid;		/* This lost # */
+    int lost_uid;		/* lost ID */
     char lost_type;		/* Type of thing (ship, plane, nuke, land, sector) */
-    short lost_id;		/* ID of thing */
+    short lost_id;		/* ID of lost thing */
     coord lost_x;
     coord lost_y;
     time_t lost_timestamp;	/* When it was lost */
diff --git a/include/nuke.h b/include/nuke.h
index 9cbb5257..a5a4f688 100644
--- a/include/nuke.h
+++ b/include/nuke.h
@@ -43,8 +43,8 @@ struct nukstr {
     coord nuk_x;		/* current loc of device */
     coord nuk_y;
     s_char nuk_n;		/* number of nukes in list */
-    short nuk_ship;		/* currently aboard ship */
-    short nuk_trade;		/* index into trade file */
+    short nuk_ship;		/* currently aboard ship (unused) */
+    short nuk_trade;		/* index into trade file (unused) */
     short nuk_types[N_MAXNUKE];	/* # of nukes in sector of given type */
     time_t nuk_timestamp;	/* Last time this nuke was touched */
 };