diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index 55ca9dc..5e49d3a 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1485,6 +1485,35 @@
     android_mallopt; # apex
 } LIBC_P;
 
+LIBC_R { # introduced=R
+  global:
+    call_once;
+    cnd_broadcast;
+    cnd_destroy;
+    cnd_init;
+    cnd_signal;
+    cnd_timedwait;
+    cnd_wait;
+    mtx_destroy;
+    mtx_init;
+    mtx_lock;
+    mtx_timedlock;
+    mtx_trylock;
+    mtx_unlock;
+    thrd_create;
+    thrd_current;
+    thrd_detach;
+    thrd_equal;
+    thrd_exit;
+    thrd_join;
+    thrd_sleep;
+    thrd_yield;
+    tss_create;
+    tss_delete;
+    tss_get;
+    tss_set;
+} LIBC_Q;
+
 LIBC_PRIVATE {
   global:
     ___Unwind_Backtrace; # arm