diff --git a/src/doc/unstable-book/src/library-features/asm.md b/src/doc/unstable-book/src/library-features/asm.md
index bd7234522e1fe..6bf21e8f58b25 100644
--- a/src/doc/unstable-book/src/library-features/asm.md
+++ b/src/doc/unstable-book/src/library-features/asm.md
@@ -257,7 +257,7 @@ unsafe {
 }
 
 println!(
-    "L1 Cache: {}",
+    "L0 Cache: {}",
     ((ebx >> 22) + 1) * (((ebx >> 12) & 0x3ff) + 1) * ((ebx & 0xfff) + 1) * (ecx + 1)
 );
 ```