diff --git a/doc/src/sgml/glossary.sgml b/doc/src/sgml/glossary.sgml
index a81c17a8690..487af1fed88 100644
--- a/doc/src/sgml/glossary.sgml
+++ b/doc/src/sgml/glossary.sgml
@@ -2213,7 +2213,8 @@
WAL writer (process)
- A process that writes WAL records
+ An auxiliary process
+ that writes WAL records
from shared memory to
WAL files.