diff --git a/cmd.c b/cmd.c
index eefe42d..d8080d9 100644
--- a/cmd.c
+++ b/cmd.c
@@ -68,12 +68,24 @@ cmd_protect(struct hmt *hmt, int flag)
 void
 cmd_encrypted(struct hmt *hmt, int flag)
 {
-	CHECK_OFFSET(HMT_ENCRYPTED);
+	CHECK_OFFSET(HMT_FLAGS3);
 
 	if (flag)
-		hmt->bin[HMT_ENCRYPTED] |= HMT_IS_ENCRYPTED;
+		hmt->bin[HMT_FLAGS3] |= HMT_IS_ENCRYPTED;
 	else
-		hmt->bin[HMT_ENCRYPTED] &= ~HMT_IS_ENCRYPTED;
+		hmt->bin[HMT_FLAGS3] &= ~HMT_IS_ENCRYPTED;
+	hmt->modified++;
+}
+
+void
+cmd_thumbnail(struct hmt *hmt, int flag)
+{
+	CHECK_OFFSET(HMT_FLAGS3);
+
+	if (flag)
+		hmt->bin[HMT_FLAGS3] |= HMT_HAS_THUMBNAIL;
+	else
+		hmt->bin[HMT_FLAGS3] &= ~HMT_HAS_THUMBNAIL;
 	hmt->modified++;
 }
 
diff --git a/hmt.c b/hmt.c
index 925a109..bbf0d42 100644
--- a/hmt.c
+++ b/hmt.c
@@ -84,6 +84,8 @@ hmt_is(struct hmt *hmt, enum hmt_attribute attr)
 	{
 	    case HMTA_ENCRYPTED:
 		return hmt->flags2 & 0x1;
+	    case HMTA_THUMBNAIL:
+		return hmt->flags2 & 0x2;
 	    case HMTA_GHOST:
 		return hmt->flags2 & 0x8;
 	    case HMTA_LOCKED:
@@ -134,6 +136,8 @@ hmt_flags(struct hmt *hmt)
 		strcat(buf, "Guidance,");
 	if (hmt_is(hmt, HMTA_ENCRYPTED))
 		strcat(buf, "ODEncrypted,");
+	if (hmt_is(hmt, HMTA_THUMBNAIL))
+		strcat(buf, "Thumbnail,");
 	if (hmt_is(hmt, HMTA_SHRUNK))
 		strcat(buf, "Shrunk,");
 	if (hmt_is(hmt, HMTA_DEDUPED))
diff --git a/hmt.h b/hmt.h
index 81b6258..89b2b14 100644
--- a/hmt.h
+++ b/hmt.h
@@ -12,6 +12,7 @@ enum hmt_attribute {
 	HMTA_UNLIMITEDCOPY,
 	HMTA_RADIO,
 	HMTA_GHOST,
+	HMTA_THUMBNAIL,
 };
 
 struct hmt {
@@ -104,8 +105,9 @@ int hmt_is(struct hmt *, enum hmt_attribute);
 #define HMT_FLAGS1_LOCKED	0x4
 #define HMT_FLAGS1_NEW		0x8
 
-#define HMT_ENCRYPTED		0x28e
+#define HMT_FLAGS3		0x28e
 #define HMT_IS_ENCRYPTED	0x1
+#define HMT_HAS_THUMBNAIL	0x2
 
 #define HMT_BOOKMARKS_CNT	0x298
 #define HMT_BOOKMARKS		0x31c
diff --git a/lint.h b/lint.h
index 61b2095..f48d1e9 100644
--- a/lint.h
+++ b/lint.h
@@ -25,6 +25,7 @@ void cmd_encrypted(struct hmt *, int);
 void cmd_shrunk(struct hmt *, int);
 void cmd_dedup(struct hmt *, int);
 void cmd_detectads(struct hmt *, int);
+void cmd_thumbnail(struct hmt *, int);
 void cmd_new(struct hmt *, int);
 void cmd_lock(struct hmt *, int);
 void cmd_guidance(struct hmt *, int);
diff --git a/main.c b/main.c
index 3876aab..278b354 100644
--- a/main.c
+++ b/main.c
@@ -38,6 +38,7 @@ syntax()
 	    "    +/-shrunk     Mark/unmark recording as shrunk.\n"
 	    "    +/-dedup      Mark/unmark recording as deduped.\n"
 	    "    +/-detectads  Mark/unmark recording as ad-detection-done.\n"
+	    "    +/-thumbnail  Mark/unmark recording as thumbnail present.\n"
 	);
 	fprintf(stderr,
 	    "    -p            Display parseable file information (see *).\n"
@@ -100,6 +101,7 @@ main(int argc, char **argv)
 		CMD_PROTECT,
 		CMD_GUIDANCE,
 		CMD_ENCRYPTED,
+		CMD_THUMBNAIL,
 		CMD_SHRUNK,
 		CMD_DEDUP,
 		CMD_DETECTADS,
@@ -116,7 +118,7 @@ main(int argc, char **argv)
 		CMD_SETBOOKMARKS,
 		CMD_CLEARBOOKMARKS,
 		CMD_PATCH,
-		CMD_UNPATCH
+		CMD_UNPATCH,
 	} cmd = CMD_LIST;
 	char *newstr = "";
 	int i, toggle;
@@ -168,6 +170,8 @@ main(int argc, char **argv)
 			cmd = CMD_DEDUP;
 		else if (!strcmp(argv[1] + 1, "detectads"))
 			cmd = CMD_DETECTADS;
+		else if (!strcmp(argv[1] + 1, "thumbnail"))
+			cmd = CMD_THUMBNAIL;
 		else if (!strcmp(argv[1] + 1, "bookmarks"))
 			cmd = CMD_BOOKMARKS;
 		else if (!strncmp(argv[1], "+patch", 6))
@@ -304,6 +308,10 @@ main(int argc, char **argv)
 			cmd_detectads(hmt, toggle);
 			break;
 
+		    case CMD_THUMBNAIL:
+			cmd_thumbnail(hmt, toggle);
+			break;
+
 		    case CMD_SETTITLE:
 			cmd_settitle(hmt, newstr);
 			break;