diff --git a/libc/include/stdio_ext.h b/libc/include/stdio_ext.h
index 66a3ab9..2f0f438 100644
--- a/libc/include/stdio_ext.h
+++ b/libc/include/stdio_ext.h
@@ -37,9 +37,9 @@
 
 size_t __fbufsize(FILE* __fp) __INTRODUCED_IN(23);
 int __freadable(FILE* __fp) __INTRODUCED_IN(23);
-int __freading(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __freading(FILE* __fp) __INTRODUCED_IN(28);
 int __fwritable(FILE* __fp) __INTRODUCED_IN(23);
-int __fwriting(FILE* __fp) __INTRODUCED_IN_FUTURE;
+int __fwriting(FILE* __fp) __INTRODUCED_IN(28);
 int __flbf(FILE* __fp) __INTRODUCED_IN(23);
 void __fpurge(FILE* __fp) __INTRODUCED_IN(23);
 size_t __fpending(FILE* __fp) __INTRODUCED_IN(23);