diff --git a/store/store.go b/store/store.go
index 80d56c1..200ff61 100644
--- a/store/store.go
+++ b/store/store.go
@@ -9,15 +9,15 @@ import (
 type BlobStore interface {
 	// Name of blob store (useful for metrics)
 	Name() string
-	// Does blob exist in the store
+	// Does blob exist in the store.
 	Has(hash string) (bool, error)
-	// Get the blob from the store
+	// Get the blob from the store. Must return ErrBlobNotFound if blob is not in store.
 	Get(hash string) (stream.Blob, error)
-	// Put the blob into the store
+	// Put the blob into the store.
 	Put(hash string, blob stream.Blob) error
-	// Put an SD blob into the store
+	// Put an SD blob into the store.
 	PutSD(hash string, blob stream.Blob) error
-	// Delete the blob from the store
+	// Delete the blob from the store.
 	Delete(hash string) error
 }