diff --git a/libc/tools/check-symbols-glibc.py b/libc/tools/check-symbols-glibc.py
index 27f4df1..4de0181 100755
--- a/libc/tools/check-symbols-glibc.py
+++ b/libc/tools/check-symbols-glibc.py
@@ -190,18 +190,18 @@
   'a64l', # obsolete
   'confstr', # obsolete
   'endutxent', # no utmp on Android
-  'fattach', # obsolete
-  'fdetach', # obsolete
+  'fattach', # <stropts.h> marked obsolescent
+  'fdetach', # <stropts.h> marked obsolescent
   'fmtmsg', # unused
   'getdate', # unused
   'getdate_err', # unused
   'gethostid', # obsolete
-  'getmsg', # obsolete
-  'getpmsg', # obsolete
+  'getmsg', # <stropts.h> marked obsolescent
+  'getpmsg', # <stropts.h> marked obsolescent
   'getutxent', # no utmp on Android
   'getutxid', # no utmp on Android
   'getutxline', # no utmp on Android
-  'isastream', # obsolete
+  'isastream', # <stropts.h> marked obsolescent
   'l64a', # obsolete
   'mq_close', # disallowed by SELinux
   'mq_getattr', # disallowed by SELinux
@@ -215,8 +215,8 @@
   'mq_unlink', # disallowed by SELinux
   'pthread_getconcurrency', # marked obsolescent
   'pthread_setconcurrency', # marked obsolescent
-  'putmsg', # obsolete
-  'putpmsg', # obsolete
+  'putmsg', # <stropts.h> marked obsolescent
+  'putpmsg', # <stropts.h> marked obsolescent
   'pututxline', # no utmp on Android
   'shm_open', # disallowed by SELinux
   'shm_unlink', # disallowed by SELinux
@@ -224,7 +224,7 @@
   'sockatmark', # obsolete (https://tools.ietf.org/html/rfc6093)
   'strfmon', # icu4c
   'strfmon_l', # icu4c
-  'ulimit', # obsolete
+  'ulimit', # <ulimit.h> marked obsolescent
 ])
 
 posix = posix - in_posix_and_glibc_but_dead_or_useless