diff --git a/man7/signal-safety.7 b/man7/signal-safety.7
index 0ca44b122..42c639478 100644
--- a/man7/signal-safety.7
+++ b/man7/signal-safety.7
@@ -301,6 +301,27 @@ or
 .BR siglongjmp (3)
 and the program subsequently calls an unsafe function,
 then the behavior of the program is undefined.
+.\"
+.SS Deviations in the GNU C library
+The following known deviations from the standard occur in
+the GNU C library:
+.IP * 3
+Before glibc 2.24,
+.BR execl (3)
+and
+.BR execle (3)
+employed
+.BR realloc (3)
+internally and were consequently not async-signal-safe.
+.\" https://sourceware.org/bugzilla/show_bug.cgi?id=19534
+This was fixed in glibc 2.24.
+.IP *
+.\" FIXME . https://sourceware.org/bugzilla/show_bug.cgi?id=13172
+The glibc implementation of
+.BR aio_suspend (3)
+is not async-signal-safe because it uses
+.BR pthread_mutex_lock (3)
+internally.
 .SH SEE ALSO
 .BR sigaction (2),
 .BR signal (7),