readme : fix zig build instructions (#2171)

diff --git a/README.md b/README.md
index 63457b6aedf8921da6849e5a2d7253ec4ac99f99..476cc438baa2e4116fbcf87af48667ea109d918c 100644 (file)
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ In order to build llama.cpp you have three different options.
 - Using `Zig`:
 
     ```bash
-    zig build -Drelease-fast
+    zig build -Doptimize=ReleaseFast
     ```
 
 ### Metal Build