diff --git a/configure.in b/configure.in
index f8113fdb..b1490de7 100644
--- a/configure.in
+++ b/configure.in
@@ -356,7 +356,8 @@ AH_TEMPLATE(FLAC__ALIGN_MALLOC_DATA,  [define if XXX])
 AH_TEMPLATE(FLAC__CPU_IA32,  [define if building for ia32/i386])
 AH_TEMPLATE(FLAC__CPU_PPC,  [define if building for PowerPC])
 AH_TEMPLATE(FLAC__CPU_SPARC,  [define if building for SPARC])
-AH_TEMPLATE(FLAC__EXHAUSTIVE_TESTS,  [define to XXX])
+AH_TEMPLATE(FLAC__EXHAUSTIVE_TESTS,  [define to run even more tests])
+AH_TEMPLATE(FLAC__VALGRIND_TESTING,  [define to enable use of Valgrind in testers])
 AH_TEMPLATE(FLAC__HAS_ID3LIB,  [define if you have the id3lib library])
 AH_TEMPLATE(FLAC__HAS_NASM,  [define if you have the NASM assembler])
 AH_TEMPLATE(FLAC__HAS_OGG,  [define if you have the ogg library])