diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 036f6c7997..c308d2943c 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -332,6 +332,10 @@ time float::
 size decimal::
     Size of the resulting packfile in bytes.
 
+kind string:
+    Either "clone" (when the client did not give us any "have", and asked
+    for all our refs with "want"), or "fetch" (otherwise).
+
 pre-auto-gc
 -----------
 
diff --git a/t/t5501-post-upload-pack.sh b/t/t5501-post-upload-pack.sh
index 47ee7b5039..d89fb51bad 100755
--- a/t/t5501-post-upload-pack.sh
+++ b/t/t5501-post-upload-pack.sh
@@ -29,7 +29,9 @@ test_expect_success initial '
 	) &&
 	want=$(sed -n "s/^want //p" "$LOGFILE") &&
 	test "$want" = "$(git rev-parse --verify B)" &&
-	! grep "^have " "$LOGFILE"
+	! grep "^have " "$LOGFILE" &&
+	kind=$(sed -n "s/^kind //p" "$LOGFILE") &&
+	test "$kind" = fetch
 '
 
 test_expect_success second '
@@ -43,7 +45,25 @@ test_expect_success second '
 	want=$(sed -n "s/^want //p" "$LOGFILE") &&
 	test "$want" = "$(git rev-parse --verify C)" &&
 	have=$(sed -n "s/^have //p" "$LOGFILE") &&
-	test "$have" = "$(git rev-parse --verify B)"
+	test "$have" = "$(git rev-parse --verify B)" &&
+	kind=$(sed -n "s/^kind //p" "$LOGFILE") &&
+	test "$kind" = fetch
+'
+
+test_expect_success all '
+	rm -fr sub &&
+	HERE=$(pwd) &&
+	git init sub &&
+	(
+		cd sub &&
+		git clone "file://$HERE/.git" new
+	) &&
+	sed -n "s/^want //p" "$LOGFILE" | sort >actual &&
+	git rev-parse A B C | sort >expect &&
+	test_cmp expect actual &&
+	! grep "^have " "$LOGFILE" &&
+	kind=$(sed -n "s/^kind //p" "$LOGFILE") &&
+	test "$kind" = clone
 '
 
 test_done
diff --git a/upload-pack.c b/upload-pack.c
index 857440d579..8e82179c93 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -187,6 +187,10 @@ static int run_post_upload_pack_hook(size_t total, struct timeval *tv)
 					(long)tv->tv_sec, (long)tv->tv_usec);
 	if (!err)
 		err |= feed_msg_to_hook(proc.in, "size %ld\n", (long)total);
+	if (!err)
+		err |= feed_msg_to_hook(proc.in, "kind %s\n",
+					(nr_our_refs == want_obj.nr && !have_obj.nr)
+					? "clone" : "fetch");
 	if (close(proc.in))
 		err = 1;
 	if (finish_command(&proc))