From 48d6cf9fb9ef81de7c189069c784a2fac15c6dd6 Mon Sep 17 00:00:00 2001
From: Vedant Puri <vedantpuri@gmail.com>
Date: Sun, 18 Jun 2023 14:35:24 -0400
Subject: [PATCH 1/2] 3 arg default_update_func

---
 src/interface.jl | 11 +++++++----
 src/matrix.jl    |  1 +
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/interface.jl b/src/interface.jl
index a428ac43..3b2f3dcf 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -5,21 +5,24 @@
 ###
 
 """
-$SIGNATURES
+    DEFAULT_UPDATE_FUNC(u, p, t) -> nothing
+
+    DEFAULT_UPDATE_FUNC(A, u, p, t) -> A
 
 The default update function for `AbstractSciMLOperator`s, a no-op that
 leaves the operator state unchanged.
 """
+DEFAULT_UPDATE_FUNC(u, p, t) = nothing
 DEFAULT_UPDATE_FUNC(A, u, p, t) = A
 
 const UPDATE_COEFFS_WARNING = """
 !!! warning
-    The user-provided `update_func[!]` must not use `u` in
-    its computation. Positional argument `(u, p, t)` to `update_func[!]` are
+    The user-provided `update_func` must not use `u` in
+    its computation. Positional argument `(u, p, t)` to `update_func` are
     passed down by `update_coefficients[!](L, u, p, t)`, where `u` is the
     input-vector to the composite `AbstractSciMLOperator`. For that reason,
     the values of `u`, or even shape, may not correspond to the input
-    expected by `update_func[!]`. If an operator's state depends on its
+    expected by `update_func`. If an operator's state depends on its
     input vector, then it is, by definition, a nonlinear operator.
     We recommend sticking such nonlinearities in `FunctionOperator.`
     This topic is further discussed in
diff --git a/src/matrix.jl b/src/matrix.jl
index 992e5cca..34cce8e6 100644
--- a/src/matrix.jl
+++ b/src/matrix.jl
@@ -9,6 +9,7 @@ to `update_coefficients[!](L, u, p, t)`. Both recursively call the
 `update_function`, `update_func` which is assumed to have the signature
 
     update_func(A::AbstractMatrix, u, p, t; <accepted kwargs>) -> newA
+
 or
 
     update_func!(A::AbstractMatrix, u ,p , t; <accepted kwargs>) -> [modifies A]

From d8527f08189d36967540c9c50a6c1296e90321a5 Mon Sep 17 00:00:00 2001
From: Vedant Puri <vedantpuri@gmail.com>
Date: Sun, 18 Jun 2023 23:22:39 -0400
Subject: [PATCH 2/2] bump project.toml

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 627f4264..bcd4478e 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "SciMLOperators"
 uuid = "c0aeaf25-5076-4817-a8d5-81caf7dfa961"
 authors = ["Vedant Puri <vedantpuri@gmail.com>"]
-version = "0.3.1"
+version = "0.4.0"
 
 [deps]
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"