updates

README.md

@@ -84,6 +84,8 @@ cc app.c -lcdda_paranoia -lcdda_interface
 
 The public `cdrom_drive` layout, `TOC` layout, function-pointer fields, error
 codes and `paranoia_*` entry points match cdparanoia 10.2 on 64-bit Linux.
+The test interface is exported as `cdda_identify_test()` and declared when a
+caller defines `CDDA_TEST`, matching the original source tree.
 
 ## Testing without a CD drive
 
@@ -144,8 +146,10 @@ CD-ROM drive.  When hardware is available, verify:
   generic device where the kernel supports it.
 - `-i/--output-info` is accepted but is a no-op, matching the 10.2 source.
 - 64-bit Linux ABI is the primary target.
-- The `-A` cache analysis is a compact functional port; its timing
-  recommendations should be treated as advisory.
+- `-A` is a full port of `cachetest.c`, including the fast/slow cache-size
+  search, readahead, rollbehind, cache-tail granularity and backseek-flush
+  tests.  Its findings still depend on drive firmware and system load, as with
+  the original.
 
 ## Licence