diff --git a/docs/union.md b/docs/union.md
index 04b1c0e..833d834 100644
--- a/docs/union.md
+++ b/docs/union.md
@@ -82,7 +82,7 @@ printf("%d\n", x.a);           // 12
 printf("%d\n", *foo_int_p);    // 12
 
 x.b = 3.141592;
-printf("%f\n", x.g);           // 3.141592
+printf("%f\n", x.b);           // 3.141592
 printf("%f\n", *foo_float_p);  // 3.141592
 ```