diff --git a/docs/src/index.md b/docs/src/index.md
index ed96e4e..ffe85ba 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -163,8 +163,6 @@ This API describes how you can implement your own `Process` subtype, if the [exi
 
 ```@docs
 Process
-rhs
-timescale
 NoTimeDerivative
 ```
 
diff --git a/src/API.jl b/src/API.jl
index b2f0c7e..6070ae6 100644
--- a/src/API.jl
+++ b/src/API.jl
@@ -1,5 +1,5 @@
 """
-A process subtype `p::Process` extends the functions:
+A process subtype `p::Process` extends the `ProcessBasedModelling` unexported functions:
 - `lhs_variable(p)` which returns the variable the process describes
   (left-hand-side variable). There is a default implementation
   `lhs_variable(p) = p.variable` if the field exists.
@@ -19,7 +19,7 @@ abstract type Process end
 """
     NoTimeDerivative()
 
-Singleton value that is the default output of the [`timescale`](@ref) function
+Singleton value that is the default output of the `timescale` function
 for variables that do not vary in time autonomously, i.e., they have no d/dt derivative
 and hence the concept of a "timescale" does not apply to them.
 """