Documentation/technical/data_structures.txt | 10 ++++------

diff --git a/Documentation/technical/data_structures.txt b/Documentation/technical/data_structures.txt
index 8776a67b969500db69bd858ef9e7da214f7d0566..4dcf9ce609be486965076f0817b9981070aafa1a 100644
--- a/Documentation/technical/data_structures.txt
+++ b/Documentation/technical/data_structures.txt
@@ -222,10 +222,8 @@   This is currently a singleton, but it is associated with a
   given PublicInbox::Config which may be instantiated more than
   once in the future.
 
-* PublicInbox::ParentPipe
-
-  Per-worker process class to detect shutdown of master process.
-  This is not used if using -W0 to disable worker processes
-  in public-inbox-httpd or public-inbox-nntpd.
+* PublicInbox::EOFpipe
 
-  This is a per-worker singleton.
+  Used throughout to trigger a callback when a pipe(7) is closed.
+  This is frequently used to portably detect process exit without
+  relying on a catch-all waitpid(-1, ...) call.