diff --git a/man2/ptrace.2 b/man2/ptrace.2
index 997a73a8a..0977623e3 100644
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -1046,7 +1046,9 @@ struct ptrace_syscall_info {
         struct {     /* op == PTRACE_SYSCALL_INFO_EXIT */
             __s64 rval;        /* System call return value */
             __u8 is_error;     /* System call error flag;
-                                  Boolean: is rval != 0? */
+                                  Boolean: does rval contain
+                                  an error value (\-ERRCODE) or
+                                  a nonerror return value? */
         } exit;
         struct {     /* op == PTRACE_SYSCALL_INFO_SECCOMP */
             __u64 nr;          /* System call number */