diff --git a/blobs.go b/blobs.go
index 42a437738..c0e9261be 100644
--- a/blobs.go
+++ b/blobs.go
@@ -67,7 +67,7 @@ type Descriptor struct {
 	Size int64 `json:"size,omitempty"`
 
 	// Digest uniquely identifies the content. A byte stream can be verified
-	// against against this digest.
+	// against this digest.
 	Digest digest.Digest `json:"digest,omitempty"`
 
 	// URLs contains the source URLs of this content.