diff --git a/2022.md b/2022.md
index f67a9402..3e885976 100644
--- a/2022.md
+++ b/2022.md
@@ -45,6 +45,7 @@ of Code] event.
     * [LDPL](#ldpl)
     * [Lua](#lua)
     * [MATLAB](#matlab)
+    * [M4](#m4)
     * [Nim](#nim)
     * [Objective-C](#objc)
     * [OCaml](#ocaml)
@@ -442,6 +443,12 @@ Read [CONTRIBUTING.md](/.github/CONTRIBUTING.md) to learn how to add your own re
 
 *Solutions to AoC in MATLAB (Octave).*
 
+#### M4
+
+*Solutions to AoC in M4.*
+
+* [aoc_eblake](https://repo.or.cz/aoc_eblake.git)
+
 #### Nim
 
 *Solutions to AoC in Nim.*
diff --git a/README.md b/README.md
index e73fec38..19aecee8 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,7 @@ This is a collection of awesome resources related to the yearly
     * [LDPL](#ldpl)
     * [Lua](#lua)
     * [MATLAB](#matlab)
+    * [M4](#m4)
     * [Nim](#nim)
     * [Objective-C](#objc)
     * [OCaml](#ocaml)
@@ -361,6 +362,12 @@ Read [CONTRIBUTING.md](/.github/CONTRIBUTING.md) to learn how to add your own re
 
 *Solutions to AoC in MATLAB (Octave).*
 
+#### M4
+
+*Solutions to AoC in M4.*
+
+* [aoc_eblake](https://repo.or.cz/aoc_eblake.git)
+
 #### Nim
 
 *Solutions to AoC in Nim.*