diff --git a/libc/bionic/malloc_tagged_pointers.h b/libc/bionic/malloc_tagged_pointers.h
index de3cc2e..484a080 100644
--- a/libc/bionic/malloc_tagged_pointers.h
+++ b/libc/bionic/malloc_tagged_pointers.h
@@ -99,9 +99,10 @@
   // check below allows us to turn *off* pointer tagging (by setting PointerCheckMask() and
   // FixedPointerTag() to zero) and still allow tagged heap allocations to be freed.
   if ((ptr_int & PointerCheckMask()) != FixedPointerTag()) {
-    // TODO(b/145604058) - Upstream tagged pointers documentation and provide
-    // a link to it in the abort message here.
-    async_safe_fatal("Pointer tag for %p was truncated.", ptr);
+    async_safe_fatal(
+        "Pointer tag for %p was truncated, see "
+        "'https://source.android.com/devices/tech/debug/tagged-pointers'.",
+        ptr);
   }
   return reinterpret_cast<void*>(ptr_int & PointerUntagMask());
 }