diff --git a/src/Common.cpp b/src/Common.cpp
index 5905fe8..c40819e 100644
--- a/src/Common.cpp
+++ b/src/Common.cpp
@@ -291,6 +291,7 @@ TEST_CASE("RegisterThread") {
     CHECK(threadNameMap.at(std::this_thread::get_id()) == "MyThread");
 }
 
+// macros below need to be undefined on FreeBSD as to avoid naming collision with system headers
 #ifdef BEAMMP_FREEBSD
     #undef major
     #undef minor