docs update

Author: j-fu

CHANGELOG.md

@@ -1,10 +1,10 @@
 # Changelog
 
-## [2.0.0] - Planned
+## [2.0.0] - 2026-01-06
 
 - Remove solver + precon API which is not based on precs or directly overloading `\`.
   Fully rely on LinearSolve (besides `\`)
-- Move AMGBuilder etc corresponding packages (depending on the PRs)
+- Move AMGBuilder etc to corresponding packages (depending on the PRs)
 - Keep ILUZeroPreconBuilder, JacobiPreconBuilder
 - ExtendableSparseMatrix is now GenericExtendableSparseMatrix{SparseMatrixLNK}
 - Changes should be non-breaking if only ExtendableSparseMatrix was used, and no solvers or preconditioners

docs/src/extensions.md

@@ -1,4 +1,4 @@
-#  Matrix extensions
+# Matrix extensions
 
 ## AbstractSparseMatrixExtension
 ```@docs

docs/src/extsparse.md

@@ -1,10 +1,23 @@
 # Extendable matrices
+The type hierarchy of extendable matrices in this package is as follows:
+
+[`ExtendableSparse.AbstractExtendableSparseMatrixCSC`](@ref) `<: SparseArrays.AbstractSparseMatrixCSC <: SparseArrays.AbstractSparseMatrix <: AbstractMatrix`
+
+The package defines two [subtypes](#Subtypes-of-AbstractExtendableSparseMatrixCSC) of [`ExtendableSparse.AbstractExtendableSparseMatrixCSC`](@ref) which are parametrized by types of [extension matrices](/extensions/#Matrix-extensions):
+- [`ExtendableSparse.GenericExtendableSparseMatrixCSC`](@ref) for single threaded assembly
+- [`ExtendableSparse.GenericMTExtendableSparseMatrixCSC`](@ref) for multithreaded assembly
+
+User facing defaults are defined by [type aliases](#Type-aliases):
+- `const MTExtendableSparseMatrixCSC = GenericMTExtendableSparseMatrixCSC{SparseMatrixDILNKC}`
+- `const STExtendableSparseMatrixCSC = GenericExtendableSparseMatrixCSC{SparseMatrixLNK}`
+- `const ExtendableSparseMatrixCSC = STExtendableSparseMatrixCSC`
+- `const ExtendableSparseMatrix = ExtendableSparseMatrixCSC`
 
 ## Abstract type
 ```@docs
 ExtendableSparse.AbstractExtendableSparseMatrixCSC
 ```
-## Implemented subtypes
+## Subtypes of AbstractExtendableSparseMatrixCSC
 ```@docs
 ExtendableSparse.GenericExtendableSparseMatrixCSC
 ExtendableSparse.GenericMTExtendableSparseMatrixCSC