diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 781ee4351..91bd85e43 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -38,6 +38,11 @@
 
 #endif
 
+/**
+  On MSVC qsort requires functions passed to it use the __cdecl calling conversion(CC). 
+  This explictly marks such functions as __cdecl so that the code will still compile 
+  if a CC other than __cdecl has been made the default.
+*/
 #if  defined(_MSC_VER)
 #  define WIN_CDECL __cdecl
 #else