diff --git a/C#-and-.NET-docs-supplement.md b/C#-and-.NET-docs-supplement.md
index efdc07f..920c386 100644
--- a/C#-and-.NET-docs-supplement.md
+++ b/C#-and-.NET-docs-supplement.md
@@ -56,6 +56,10 @@ The table [here](https://learn.microsoft.com/en-us/dotnet/csharp/language-refere
 
 That is, you must use `#if !(NETSTANDARD2_1_OR_GREATER || NETCOREAPP2_1_OR_GREATER)` and not just `#if !NETSTANDARD2_1_OR_GREATER`.
 
+## Signed/Unsigned byte array casting
+
+As Jon Skeet himself explains [here](https://stackoverflow.com/a/11039703), "Even though in C# you can't cast a `byte[]` to an `sbyte[]` directly, the CLR allows it". This leads to some weird behaviour, since the compiler is hardcoded to replace *only some* type checks with consts.
+
 ## `String.GetHashCode` stability
 
 The `GetHashCode` implementation for strings does not reflect the string's contents, and as such, the hash not stable between program instances.