diff --git a/apex/Android.bp b/apex/Android.bp
index 39137fb..1943940 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -44,6 +44,12 @@
     args: mainline_stubs_args,
     installable: false,
     sdk_version: "current",
+    check_api: {
+        current: {
+            api_file: "api/current.txt",
+            removed_api_file: "api/removed.txt",
+        },
+    },
 }
 
 stubs_defaults {
@@ -52,6 +58,12 @@
     libs: ["framework-annotations-lib"],
     installable: false,
     sdk_version: "system_current",
+    check_api: {
+        current: {
+            api_file: "api/system-current.txt",
+            removed_api_file: "api/system-removed.txt",
+        },
+    },
 }
 
 // The defaults for module_libs comes in two parts - defaults for API checks
@@ -65,6 +77,12 @@
     libs: ["framework-annotations-lib"],
     installable: false,
     sdk_version: "module_current",
+    check_api: {
+        current: {
+            api_file: "api/module-lib-current.txt",
+            removed_api_file: "api/module-lib-removed.txt",
+        },
+    },
 }
 
 stubs_defaults {
diff --git a/apex/sdkextensions/framework/api/current.txt b/apex/sdkextensions/framework/api/current.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/apex/sdkextensions/framework/api/current.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/apex/sdkextensions/framework/api/module-lib-current.txt b/apex/sdkextensions/framework/api/module-lib-current.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/apex/sdkextensions/framework/api/module-lib-current.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/apex/sdkextensions/framework/api/module-lib-removed.txt b/apex/sdkextensions/framework/api/module-lib-removed.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/apex/sdkextensions/framework/api/module-lib-removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/apex/sdkextensions/framework/api/removed.txt b/apex/sdkextensions/framework/api/removed.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/apex/sdkextensions/framework/api/removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0
diff --git a/apex/sdkextensions/framework/api/system-current.txt b/apex/sdkextensions/framework/api/system-current.txt
new file mode 100644
index 0000000..bbff4c5
--- /dev/null
+++ b/apex/sdkextensions/framework/api/system-current.txt
@@ -0,0 +1,9 @@
+// Signature format: 2.0
+package android.os.ext {
+
+  public class SdkExtensions {
+    method public static int getExtensionVersion(int);
+  }
+
+}
+
diff --git a/apex/sdkextensions/framework/api/system-removed.txt b/apex/sdkextensions/framework/api/system-removed.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/apex/sdkextensions/framework/api/system-removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0