diff --git a/.gitmodules b/.gitmodules
index 79585ce..4564bbe 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -161,3 +161,6 @@
 [submodule "2022/iasoon"]
 	path = 2022/iasoon
 	url = https://github.com/iasoon/aoc2022.git
+[submodule "2023/chvp"]
+	path = 2023/chvp
+	url = https://github.com/chvp/aoc2023.git
diff --git a/2022/README.md b/2022/README.md
new file mode 100644
index 0000000..f1c8570
--- /dev/null
+++ b/2022/README.md
@@ -0,0 +1,55 @@
+# De Zeus Advent of Code
+
+| Wie?       | Waar? (Repository)                               |              Taal? |
+|:-----------|:------------------------------------------------:|-------------------:|
+| chvp       | https://github.com/chvp/aoc2022                  |            Haskell |
+| hvdncamp   | https://github.com/hvdncamp/adventofcode-2022    |                  C |
+| mcbloch    | https://gitlab.com/mcbloch/aoc2022               | Clojure (Babashka) |
+| fbegyn     | https://github.com/fbegyn/aoc2022                |            Go/Ruby |
+| Mraedis    | https://github.com/Mraedis/AoC2022               |               Ruby |
+| silvius    | https://github.com/ajuvercr/advent-of-code       |               Rust |
+| robe       | https://github.com/SchrodingersCat00/aoc2022.git |               Rust |
+| niknetniko | https://github.com/niknetniko/AdventOfCode       |                  C |
+| jaspervdj  | https://github.com/jaspervdj/advent-of-code      |            Haskell |
+| s-minoo    | https://github.com/s-minoo/advent-of-code        |               Rust |
+| iasoon     | https://github.com/iasoon/aoc2022                |               Rust |
+
+
+* repo clonen:
+
+    ```sh
+    git clone git@github.com:ZeusWPI/Advent-of-Code-Aggregator.git
+    git submodule init 2022 # just the current year
+    git submodule update
+    ```
+
+* nieuwe persoon toevoegen:
+
+    ```sh
+    cd 2022
+    git submodule add <link zoals in tabel> <naam zoals in tabel>
+    git commit -m 'hey guys ik heb een repo toegevoegd'
+    ```
+
+* uw lokale kopie updaten:
+
+    ```sh
+    git pull # duh
+    git submodule update
+    ```
+
+* van alle submodules de nieuwste versie binnenhalen (zelfs als mensen *force push*en):
+
+    ```sh
+    git submodule foreach git fetch origin
+    git submodule foreach git reset --hard origin/HEAD > /dev/null 2>&1
+    git add * # oh no
+    git commit -m 'update submodules'
+    ```
+
+* benchmarks uitvoeren:
+
+    ```sh
+    cd 2022
+    ./complete-benchmark
+    ```
diff --git a/2023/benchmark b/2023/benchmark
new file mode 100755
index 0000000..681cbef
--- /dev/null
+++ b/2023/benchmark
@@ -0,0 +1,20 @@
+#!/bin/sh
+day="$(printf '%02d' ${1##0})"
+part="$2"
+inputfile="$PWD/../inputs/${day}.txt"
+
+[ -x "prepare" ] || exit 0
+
+if ! ./prepare "$day" "$part" "$inputfile"; then
+	echo 'eh ge hebt precies niet alles geïnstalleerd staan'
+else
+	if [ -x "run" ]; then
+		hyperfine "./run '$day' '$part' '$inputfile'"
+	fi
+fi
+
+if [ -x "clean" ]; then
+	./clean
+fi
+
+true
diff --git a/2023/chvp b/2023/chvp
new file mode 160000
index 0000000..68d2ef2
--- /dev/null
+++ b/2023/chvp
@@ -0,0 +1 @@
+Subproject commit 68d2ef220a426d5c315049a6d834f5f27cd06591
diff --git a/2023/complete-benchmark b/2023/complete-benchmark
new file mode 100755
index 0000000..7204b36
--- /dev/null
+++ b/2023/complete-benchmark
@@ -0,0 +1,30 @@
+#!/bin/sh
+day="$(printf '%02d' ${1##0})"
+part="$2"
+
+inputfile="$PWD/inputs/${day}.txt"
+
+if ! test -f "$inputfile"; then
+	echo "no input available" >&2
+	exit 1
+fi
+
+for dir in *; do
+	if test -d "$dir"; then
+		cd "$dir"
+		if test -x ./prepare; then
+			echo "---------------------------------------------------------------------------------- $dir"
+			if ! ./prepare "$day" "$part" >&2; then
+				echo 'eh ge hebt precies niet alles geïnstalleerd staan'
+			else
+				if test -x run; then
+					hyperfine -n "$dir" "./run '$day' '$part' '$inputfile'"
+				fi
+			fi
+		fi
+		if test -x ./clean; then
+			./clean "$day" "$part" "$inputfile"
+		fi
+		cd - > /dev/null 2>&1
+	fi
+done
diff --git a/README.md b/README.md
index f1c8570..7583e83 100644
--- a/README.md
+++ b/README.md
@@ -1,32 +1,22 @@
 # De Zeus Advent of Code
 
-| Wie?       | Waar? (Repository)                               |              Taal? |
-|:-----------|:------------------------------------------------:|-------------------:|
-| chvp       | https://github.com/chvp/aoc2022                  |            Haskell |
-| hvdncamp   | https://github.com/hvdncamp/adventofcode-2022    |                  C |
-| mcbloch    | https://gitlab.com/mcbloch/aoc2022               | Clojure (Babashka) |
-| fbegyn     | https://github.com/fbegyn/aoc2022                |            Go/Ruby |
-| Mraedis    | https://github.com/Mraedis/AoC2022               |               Ruby |
-| silvius    | https://github.com/ajuvercr/advent-of-code       |               Rust |
-| robe       | https://github.com/SchrodingersCat00/aoc2022.git |               Rust |
-| niknetniko | https://github.com/niknetniko/AdventOfCode       |                  C |
-| jaspervdj  | https://github.com/jaspervdj/advent-of-code      |            Haskell |
-| s-minoo    | https://github.com/s-minoo/advent-of-code        |               Rust |
-| iasoon     | https://github.com/iasoon/aoc2022                |               Rust |
+| Wie? | Waar? (Repository)              | Taal? |
+|:-----|:-------------------------------:|------:|
+| chvp | https://github.com/chvp/aoc2023 |     C |
 
 
 * repo clonen:
 
     ```sh
     git clone git@github.com:ZeusWPI/Advent-of-Code-Aggregator.git
-    git submodule init 2022 # just the current year
+    git submodule init 2023 # just the current year
     git submodule update
     ```
 
 * nieuwe persoon toevoegen:
 
     ```sh
-    cd 2022
+    cd 2023
     git submodule add <link zoals in tabel> <naam zoals in tabel>
     git commit -m 'hey guys ik heb een repo toegevoegd'
     ```
@@ -50,6 +40,6 @@
 * benchmarks uitvoeren:
 
     ```sh
-    cd 2022
+    cd 2023
     ./complete-benchmark
     ```