From 618f6d663d19382fd80702a968901c983ebcb4fd Mon Sep 17 00:00:00 2001
From: Antonis Geralis <b3lievem@yandex.com>
Date: Sun, 4 Sep 2022 20:26:51 +0300
Subject: [PATCH] readme: add section

---
 README.md | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index fe4a34c..21536d1 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,18 @@ proc mutate(value: var ClientId; sizeIncreaseHint: int; enforceChanges: bool; r:
 For aiding the creation of mutate functions, mutators for every supported type are
 exported by `drchaos/mutator`.
 
-## What's not supported
+### User-defined serializers
+
+User overloads must use the following proc signatures:
+
+```nim
+proc fromData*(data: openArray[byte]; pos: var int; output: var T)
+proc toData*(data: var openArray[byte]; pos: var int; input: T)
+```
+
+This is only necessary for destructor-based types.
+
+### What's not supported
 
 - Polymorphic types, missing serialization support.
 - References with cycles. A `.noFuzz` custom pragma will be added soon for cursors.