diff --git a/xcodeproj/targets.py b/xcodeproj/targets.py
index 7e358c8..049f39f 100755
--- a/xcodeproj/targets.py
+++ b/xcodeproj/targets.py
@@ -16,18 +16,19 @@ class PBXProductType(enum.Enum):
     """The different product types available."""
 
     # fmt: off
-    APPLICATION          = "com.apple.product-type.application"
-    BUNDLE               = "com.apple.product-type.bundle"
-    UITESTING_BUNDLE     = "com.apple.product-type.bundle.ui-testing"
-    UNIT_TEST            = "com.apple.product-type.bundle.unit-test"
-    STATIC_LIBRARY       = "com.apple.product-type.library.static"
-    LIBRARY_BUNDLE       = "com.apple.product-type.library.bundle"
-    FRAMEWORK            = "com.apple.product-type.framework"
-    STATIC_FRAMEWORK     = "com.apple.product-type.framework.static"
-    APP_EXTENSION        = "com.apple.product-type.app-extension"
-    WATCH_APP2           = "com.apple.product-type.application.watchapp2"
-    WATCH_APP2_CONTAINER = "com.apple.product-type.application.watchapp2-container"
-    WATCHKIT2_EXTENSION  = "com.apple.product-type.watchkit2-extension"
+    APPLICATION            = "com.apple.product-type.application"
+    BUNDLE                 = "com.apple.product-type.bundle"
+    UITESTING_BUNDLE       = "com.apple.product-type.bundle.ui-testing"
+    UNIT_TEST              = "com.apple.product-type.bundle.unit-test"
+    STATIC_LIBRARY         = "com.apple.product-type.library.static"
+    LIBRARY_BUNDLE         = "com.apple.product-type.library.bundle"
+    FRAMEWORK              = "com.apple.product-type.framework"
+    STATIC_FRAMEWORK       = "com.apple.product-type.framework.static"
+    APP_EXTENSION          = "com.apple.product-type.app-extension"
+    APP_EXTENSION_MESSAGES = "com.apple.product-type.app-extension.messages"
+    WATCH_APP2             = "com.apple.product-type.application.watchapp2"
+    WATCH_APP2_CONTAINER   = "com.apple.product-type.application.watchapp2-container"
+    WATCHKIT2_EXTENSION    = "com.apple.product-type.watchkit2-extension"
     # fmt: on