diff --git a/exercises/055_unions.zig b/exercises/055_unions.zig
index 5e08aa1..6339fc8 100644
--- a/exercises/055_unions.zig
+++ b/exercises/055_unions.zig
@@ -5,7 +5,7 @@
 // to store.
 //
 // In this example, an instance of Foo always takes up u64 of
-// space memory even if you're currently storing a u8.
+// space in memory even if you're currently storing a u8.
 //
 //     const Foo = union {
 //         small: u8,