diff --git a/core/clang/TARGET_x86.mk b/core/clang/TARGET_x86.mk
index 0f530b5..70cb252 100644
--- a/core/clang/TARGET_x86.mk
+++ b/core/clang/TARGET_x86.mk
@@ -2,6 +2,8 @@
 include $(BUILD_SYSTEM)/clang/x86.mk
 
 CLANG_CONFIG_x86_TARGET_TRIPLE := i686-linux-android
+# NOTE: There is no i686-linux-android prebuilt, so we must hardcode the
+# x86_64 target instead.
 CLANG_CONFIG_x86_TARGET_TOOLCHAIN_PREFIX := \
   $($(clang_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/x86_64-linux-android/bin