diff --git a/language/documentation/book/src/abilities.md b/language/documentation/book/src/abilities.md
index 2abe21b8e2..81ecc0dd2b 100644
--- a/language/documentation/book/src/abilities.md
+++ b/language/documentation/book/src/abilities.md
@@ -186,7 +186,7 @@ fun invalid_unused() {
 }
 
 fun invalid_left_in_local(): u64 {
-    let n = Cup<NoAbilities> { item: NoAbilities {}};
+    let c_n = Cup<NoAbilities> { item: NoAbilities {}};
     // Invalid return: 'c_n' has a value
     // and 'Cup<NoAbilities>' does not have 'drop'
     0