diff --git a/libc/libc.arm.map b/libc/libc.arm.map
index fe14018..31c2a53 100644
--- a/libc/libc.arm.map
+++ b/libc/libc.arm.map
@@ -399,11 +399,11 @@
     ftruncate;
     ftruncate64; # introduced-arm=12 introduced-arm64=21 introduced-mips=12 introduced-mips64=21 introduced-x86=12 introduced-x86_64=21
     ftrylockfile;
-    fts_children;
-    fts_close;
-    fts_open;
-    fts_read;
-    fts_set;
+    fts_children; # introduced=21
+    fts_close; # introduced=21
+    fts_open; # introduced=21
+    fts_read; # introduced=21
+    fts_set; # introduced=21
     ftw; # introduced-arm=17 introduced-arm64=21 introduced-mips=17 introduced-mips64=21 introduced-x86=17 introduced-x86_64=21
     ftw64; # introduced=21
     funlockfile;