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Let people know why why change 2051889 was created

Bug: 226402757
Test: N/A
Change-Id: I57cfa6382805aa20e2a905936d63ffaec6c3c236
diff --git a/core/base_rules.mk b/core/base_rules.mk
index e6b8f20..c2e6fbb 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -713,6 +713,7 @@
 endif
 ifdef LOCAL_MULTILIB
   multi_arch := true
+# These conditionals allow this functionality to be mimicked in Soong
 else ifeq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
   ifeq ($(LOCAL_MODULE_CLASS),SHARED_LIBRARIES)
     multi_arch := true