diff --git a/mania/src/core/protos/README.MD b/mania/src/core/protos/README.MD
index 94ee472..17314db 100644
--- a/mania/src/core/protos/README.MD
+++ b/mania/src/core/protos/README.MD
@@ -1,4 +1,8 @@
 ## Protos
 
+> [!NOTE]\
+> The proto files in this folder utilize the proto3 "Optional fields" feature.\
+> Please compile using a version of `libprotoc` greater than 3.15.
+
 The vast majority of the proto files originate from
 [LagrangeDev/LagrangeProto](https://github.com/LagrangeDev/LagrangeProto).