diff --git a/config.md b/config.md
index d9b6638db..8c010dcb8 100644
--- a/config.md
+++ b/config.md
@@ -51,7 +51,7 @@ Note: Any OPTIONAL field MAY also be set to null, which is equivalent to being a
 
 - **created** *string*, OPTIONAL
 
-  An ISO-8601 formatted combined date and time at which the image was created.
+  The date and time at which the image was created, expressed in Internet Date/Time Format ([RFC-3339](https://tools.ietf.org/html/rfc3339#section-5.6)).
 
 - **author** *string*, OPTIONAL
 
@@ -161,7 +161,7 @@ Note: Any OPTIONAL field MAY also be set to null, which is equivalent to being a
 
     - **created** *string*, OPTIONAL
 
-       Creation time, expressed as an ISO-8601 formatted combined date and time.
+       Creation time, expressed in Internet Date/Time Format ([RFC-3339](https://tools.ietf.org/html/rfc3339#section-5.6)).
 
     - **author** *string*, OPTIONAL
 
diff --git a/specs-go/v1/config.go b/specs-go/v1/config.go
index d42383622..278eb9bb9 100644
--- a/specs-go/v1/config.go
+++ b/specs-go/v1/config.go
@@ -76,7 +76,7 @@ type History struct {
 
 // Image is the JSON structure which describes some basic information about the image.
 type Image struct {
-	// Created defines an ISO-8601 formatted combined date and time at which the image was created.
+	// Created defines an RFC-3339 formatted combined date and time at which the image was created.
 	Created string `json:"created,omitempty"`
 
 	// Author defines the name and/or email address of the person or entity which created and is responsible for maintaining the image.