diff --git a/Project.toml b/Project.toml
index ccf25b1..2b1ffdb 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "CitableBase"
 uuid = "d6f014bd-995c-41bd-9893-703339864534"
 authors = ["Neel Smith <dnsmith.neel@gmail.com>"]
-version = "2.0.0"
+version = "2.1.0"
 
 [deps]
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
diff --git a/docs/src/implementations.md b/docs/src/implementations.md
index 1433515..3fa50ed 100644
--- a/docs/src/implementations.md
+++ b/docs/src/implementations.md
@@ -2,8 +2,8 @@
 
 ## `Urn`
 
-- [CitableText.jl](https://github.com/cite-architecture/CitableText.jl)
-- [CitableObject.jl](https://github.com/cite-architecture/CitableObject.jl)
+- the `CtsUrn`, in [CitableText.jl](https://github.com/cite-architecture/CitableText.jl)
+- the `Cite2Urn`, in [CitableObject.jl](https://github.com/cite-architecture/CitableObject.jl)
 
 
 
diff --git a/docs/src/urns.md b/docs/src/urns.md
index ca7a8d7..a5989d2 100644
--- a/docs/src/urns.md
+++ b/docs/src/urns.md
@@ -32,19 +32,10 @@ components(fake)[3] |> parts
  "objectid"
 ```
 
+All implementations of the `URN` interface should override `Base.show`, and dispatch the following two methods to type-specific functions:
 
-
-All implementations of the `URN` interface should override `Base.show`, and dispatch the following three methods to type-specific functions:
-
-- `validurn`
 - `dropversion`
 - `addversion`
 
 
-## Real implementations
-
-In practice, there are two URN classes that implement the `URN` abstract type:  
-
-1. the CTS URN (implemented in the [CitableText](https://cite-architecture.github.io/CitableText.jl/stable/) module)
-2. the CITE2 URN (implemented in the [CitableObject](https://cite-architecture.github.io/CitableObject.jl/stable/) module).