Update Introduction.md
diff --git a/doc/Introduction.md b/doc/Introduction.md
index e26239e..cebe492 100644
--- a/doc/Introduction.md
+++ b/doc/Introduction.md
@@ -74,7 +74,7 @@
     ```
     - brew install make
     - brew install cmake
-    - sbrew install gcc-c++
+    - brew install gcc-c++
     ```
 * Install dependency: