diff --git a/man2/ptrace.2 b/man2/ptrace.2
index 56dcbbf4b..ffaf8db0d 100644
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -2327,8 +2327,11 @@ On success, the
 requests return the requested data (but see NOTES),
 the
 .B PTRACE_SECCOMP_GET_FILTER
-request returns the number of instructions in the BPF program, and
-other requests return zero.
+request returns the number of instructions in the BPF program,
+the
+.B PTRACE_GET_SYSCALL_INFO
+request returns the number of bytes available to be written by the kernel,
+and other requests return zero.
 .PP
 On error, all requests return \-1, and
 .I errno