From 1242626faaddcb02ce55198cde536e84420b7453 Mon Sep 17 00:00:00 2001
From: Ghom <42542238+Ghommie@users.noreply.github.com>
Date: Thu, 20 Aug 2020 19:01:13 +0200
Subject: [PATCH] Forgot the comment.

---
 code/__DEFINES/subsystems.dm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/code/__DEFINES/subsystems.dm b/code/__DEFINES/subsystems.dm
index 9ee7f5db7e..81b5c5620f 100644
--- a/code/__DEFINES/subsystems.dm
+++ b/code/__DEFINES/subsystems.dm
@@ -146,6 +146,7 @@
 #define SSAIR_EQUALIZE 8
 #define SSAIR_ACTIVETURFS 9
 
+// |= on overlays is not actually guaranteed to not add same appearances but we're optimistically using it anyway.
 #define COMPILE_OVERLAYS(A)\
 	if (TRUE) {\
 		var/list/ad = A.add_overlays;\