diff --git a/obex/api/current.txt b/obex/api/current.txt
index 1cd562f..f142bc8 100644
--- a/obex/api/current.txt
+++ b/obex/api/current.txt
@@ -1,3 +1,4 @@
+// Signature format: 2.0
 package javax.obex {
 
   public class ObexPacket {
diff --git a/obex/api/removed.txt b/obex/api/removed.txt
index e69de29..d802177 100644
--- a/obex/api/removed.txt
+++ b/obex/api/removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/obex/api/system-current.txt b/obex/api/system-current.txt
index e69de29..d802177 100644
--- a/obex/api/system-current.txt
+++ b/obex/api/system-current.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/obex/api/system-removed.txt b/obex/api/system-removed.txt
index e69de29..d802177 100644
--- a/obex/api/system-removed.txt
+++ b/obex/api/system-removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/obex/api/test-current.txt b/obex/api/test-current.txt
index e69de29..d802177 100644
--- a/obex/api/test-current.txt
+++ b/obex/api/test-current.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/obex/api/test-removed.txt b/obex/api/test-removed.txt
index e69de29..d802177 100644
--- a/obex/api/test-removed.txt
+++ b/obex/api/test-removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0