diff --git a/doc.go b/doc.go
index b04f3ca..4534ef4 100644
--- a/doc.go
+++ b/doc.go
@@ -3,7 +3,7 @@ Package objectid implements ASN.1 Object Identifier types and methods.
 
 # Features
 
-  - Unsigned 128-bit numberForm support (allows for expressing registrations found below {joint-iso-itu-t(2) uuid(25)}, per X.670)
+  - Unsigned 128-bit numberForm support (allows for expressing registrations found below {joint-iso-itu-t(2) uuid(25)}, per [X.667](https://www.itu.int/rec/T-REC-X.667))
   - Flexible index support, allowing interrogation through negative indices without the risk of panic
   - Convenient Leaf, Parent and Root index alias methods, wherever applicable
   - Ge, Gt, Le, Lt, Equal comparison methods for interacting with NumberForm instances
@@ -16,10 +16,10 @@ For further details, see the LICENSE file within the root of the source reposito
 
 # NumberForm Maximum
 
-Valid NumberForm instances may fall between the minimum decimal value of zero (0) and the maximum decimal value of 340,282,366,920,938,463,463,374,607,431,768,211,455 (three hundred forty undecillion and change). This ensures no panics occur when parsing valid UUID-based object identifiers, such as those found beneath joint-iso-itu-t(2) uuid(25) per X.670.
+Valid NumberForm instances may fall between the minimum decimal value of zero (0) and the maximum decimal value of 340,282,366,920,938,463,463,374,607,431,768,211,455 (three hundred forty undecillion and change). This ensures no panics occur when parsing valid UUID-based object identifiers, such as those found beneath joint-iso-itu-t(2) uuid(25) per [X.667](https://www.itu.int/rec/T-REC-X.667).
 
 # Special Credit
 
-A special thanks to Luke Champine for his excellent Uint128 package (found at https://github.com/lukechampine/uint128), which is incorporated within this package for X.670 support within NumberForm instances.
+A special thanks to Luke Champine for his excellent Uint128 package (found at https://github.com/lukechampine/uint128), which is incorporated within this package for [X.667](https://www.itu.int/rec/T-REC-X.667) support within NumberForm instances.
 */
 package objectid