diff --git a/man2/prctl.2 b/man2/prctl.2
index 67b3f17ec..314c09cd1 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -803,8 +803,10 @@ and retrieved using
 The attribute is likewise accessible via
 .IR /proc/self/task/[tid]/comm ,
 where
-.I tid
-is the name of the calling thread.
+.I [tid]
+is the the thread ID of the calling thread, as returned by
+.BR gettid (2).
+.\" prctl PR_GET_NAME
 .TP
 .BR PR_GET_NAME " (since Linux 2.6.11)"
 Return the name of the calling thread,