diff --git a/libc/include/pwd.h b/libc/include/pwd.h
index e32825e..7b62644 100644
--- a/libc/include/pwd.h
+++ b/libc/include/pwd.h
@@ -119,12 +119,13 @@
 struct passwd* getpwnam(const char*);
 struct passwd* getpwuid(uid_t);
 /* Android has thousands and thousands of ids to iterate through */
-struct passwd* getpwent(void) __attribute__((warning("getpwent is inefficient on Android")));
-void setpwent(void);
+struct passwd* getpwent(void) __attribute__((warning("getpwent is inefficient on Android")))
+__INTRODUCED_IN(25);
+void setpwent(void) __INTRODUCED_IN(25);
 void endpwent(void);
 
-int getpwnam_r(const char*, struct passwd*, char*, size_t, struct passwd**);
-int getpwuid_r(uid_t, struct passwd*, char*, size_t, struct passwd**);
+int getpwnam_r(const char*, struct passwd*, char*, size_t, struct passwd**) __INTRODUCED_IN(21);
+int getpwuid_r(uid_t, struct passwd*, char*, size_t, struct passwd**) __INTRODUCED_IN(21);
 
 __END_DECLS