diff --git a/libc/include/android/dlext.h b/libc/include/android/dlext.h
index 6e32b68..05a27f3 100644
--- a/libc/include/android/dlext.h
+++ b/libc/include/android/dlext.h
@@ -129,7 +129,8 @@
   struct android_namespace_t* library_namespace;
 } android_dlextinfo;
 
-extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo);
+extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo)
+  __INTRODUCED_IN(21);
 
 /*
  * Initializes public and anonymous namespaces. The public_ns_sonames is the list of sonames
diff --git a/libc/include/android/set_abort_message.h b/libc/include/android/set_abort_message.h
index 4b3d82b..aebedba 100644
--- a/libc/include/android/set_abort_message.h
+++ b/libc/include/android/set_abort_message.h
@@ -33,7 +33,7 @@
 
 __BEGIN_DECLS
 
-void android_set_abort_message(const char* msg);
+void android_set_abort_message(const char* msg) __INTRODUCED_IN(21);
 
 __END_DECLS