diff --git a/logcat/event-log-tags b/logcat/event-log-tags
index 1262f4470..a51e2fa43 100644
--- a/logcat/event-log-tags
+++ b/logcat/event-log-tags
@@ -375,9 +375,13 @@
 #//device/dalvik/libcore/luni/src/main/native/org_apache_harmony_luni_platform_OSNetworkSystem.c
 51000 socket_stats (send|1|2),(recv|1|2),(ip|1|5),(port|1|5),(close|1|5)
 
-# db stats.  0 is query, 1 is write (may become more fine grained in the
-# future)
-52000 db_operation (name|3),(op_type|1|5),(time|2|3)
+# Database operation samples.
+# db: the filename of the database
+# sql: the executed query (without query args)
+# time: cpu time millis (not wall time), including lock acquisition
+# blocking_package: if this is on a main thread, the package name, otherwise ""
+# sample_percent: the percent likelihood this query was logged
+52000 db_operation (db|3),(sql|3),(time|1|3),(blocking_package|3),(sample_percent|1|6)
 
 # http request/response stats
 52001 http_stats (useragent|3),(response|2|3),(processing|2|3),(tx|1|2),(rx|1|2)