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-rw-r--r--doc/src/sgml/monitoring.sgml6
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index acc6e2bc316..49d4bb13b9e 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -3390,7 +3390,8 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
</para>
<para>
Time spent reading data file blocks by backends in this database,
- in milliseconds
+ in milliseconds (if <xref linkend="guc-track-io-timing"/> is enabled,
+ otherwise zero)
</para></entry>
</row>
@@ -3400,7 +3401,8 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
</para>
<para>
Time spent writing data file blocks by backends in this database,
- in milliseconds
+ in milliseconds (if <xref linkend="guc-track-io-timing"/> is enabled,
+ otherwise zero)
</para></entry>
</row>