diff --git a/util/elog/log.go b/util/elog/log.go
index 27d76c2c5..ea9ccbf22 100644
--- a/util/elog/log.go
+++ b/util/elog/log.go
@@ -12,8 +12,24 @@ func init() {
 	SetupLogging()
 }
 
+// EventLogger extends the StandardLogger interface to allow for log items
+// containing structured metadata
 type EventLogger interface {
 	StandardLogger
+
+	// Event merges structured data from the provided inputs into a single
+	// machine-readable log event.
+	//
+	// If the context contains metadata, a copy of this is used as the base
+	// metadata accumulator.
+	//
+	// If one or more loggable objects are provided, these are deep-merged into base blob.
+	//
+	// Next, the event name is added to the blob under the key "event". If
+	// the key "event" already exists, it will be over-written.
+	//
+	// Finally the timestamp and package name are added to the accumulator and
+	// the metadata is logged.
 	Event(ctx context.Context, event string, m ...Loggable)
 }