diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs
index f8d790c37852c..beb606099341e 100644
--- a/library/std/src/thread/mod.rs
+++ b/library/std/src/thread/mod.rs
@@ -1482,7 +1482,7 @@ fn _assert_sync_and_send() {
 ///
 /// Parallelism is a resource. A given machine provides a certain capacity for
 /// parallelism, i.e., a bound on the number of computations it can perform
-/// simultaneously. This number often corresponds to the amount of CPUs or
+/// simultaneously. This number often corresponds to the amount of CPUs a
 /// computer has, but it may diverge in various cases.
 ///
 /// Host environments such as VMs or container orchestrators may want to