diff --git a/go/api/command_options.go b/go/api/command_options.go
index 945a761136..daed9a9a04 100644
--- a/go/api/command_options.go
+++ b/go/api/command_options.go
@@ -359,8 +359,11 @@ func (restoreOption *RestoreOptions) SetABSTTL() *RestoreOptions {
 	return restoreOption
 }
 
+// For eviction purpose, you may use IDLETIME or FREQ modifiers.
 type Eviction struct {
-	Type  EvictionType
+	// It represent IDLETIME or FREQ.
+	Type EvictionType
+	// It represents count(int) of the idletime/frequency of object.
 	Count int64
 }