document LZ4_ALIGN_TEST

diff --git a/lib/README.md b/lib/README.md
index 3653c81..7a9e4fd 100644 (file)
--- a/lib/README.md
+++ b/lib/README.md
@@ -77,6 +77,9 @@ The following build macro can be selected to adjust source code behavior at comp
   In most cases, it's not expected to be necessary,
   but it can be legitimately considered for less common platforms.
 
+- `LZ4_ALIGN_TEST` : disable state alignment test when set to 0.
+  Is generally enabled by default, except on win32+visual.
+
 
 #### Amalgamation