diff --git a/app/cache/memory_store.go b/app/cache/memory_store.go
index 0dbc1be..a198a70 100644
--- a/app/cache/memory_store.go
+++ b/app/cache/memory_store.go
@@ -7,10 +7,15 @@ import (
 	"time"
 )
 
+// Store time function in a variable.
+// Makes it easy to travel in time when testing.
 var now = time.Now
 
 type memoryStoreItem struct {
-	value   any
+	// Actual value stored.
+	value any
+
+	// Cache expiration time.
 	expired time.Time
 }
 
diff --git a/app/cache/store.go b/app/cache/store.go
index 1b69639..a9d85e8 100644
--- a/app/cache/store.go
+++ b/app/cache/store.go
@@ -5,6 +5,7 @@ import (
 	"time"
 )
 
+// Interface to a cache storage.
 type Store interface {
 	// Set an item in the store.
 	Set(ctx context.Context, key string, value any, TTL time.Duration) error
diff --git a/app/ship_processor.go b/app/ship_processor.go
index 1f0abf1..b750cb5 100644
--- a/app/ship_processor.go
+++ b/app/ship_processor.go
@@ -74,7 +74,7 @@ func SpawnProccessor(shipStream *shipclient.Stream, loader StateLoader, saver St
 	shipStream.BlockHandler = processor.processBlock
 	shipStream.InitHandler = processor.initHandler
 
-	// Needed because if nil, traces will not be included in the response from ship.
+	// Needed because if nil, traces/table deltas will not be included in the response from ship.
 	shipStream.TraceHandler = func([]*ship.TransactionTraceV0) {}
 	shipStream.TableDeltaHandler = func([]*ship.TableDeltaV0) {}