document LZ4_ALIGN_TEST

diff --git a/lib/README.md b/lib/README.md
index 3653c810b861f0130c09842067edcfe61080abec..7a9e4fd491ff3f58317f6624527af529946dc4cd 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