diff --git a/libc/Android.bp b/libc/Android.bp
index ffa8222..dc3c73f 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -269,7 +269,7 @@
         "-DTHREAD_SAFE=1",
         // The name of the tm_gmtoff field in our struct tm.
         "-DTM_GMTOFF=tm_gmtoff",
-        // TZDEFAULT is not applicable to Android as there is no one file per time zone mapping
+        // Android uses a system property instead of /etc/localtime, so make callers crash.
         "-DTZDEFAULT=NULL",
         // Where we store our tzdata.
         "-DTZDIR=\"/system/usr/share/zoneinfo\"",