diff --git a/Install-unix.txt b/Install-unix.txt
index bd59e05..cc999c4 100644
--- a/Install-unix.txt
+++ b/Install-unix.txt
@@ -401,6 +401,9 @@
     --without-lcms
       disable LCMS support.
   
+    --without-lzma
+      disable LZMA support.
+
     --without-png
       disable PNG support.