Fix typo
diff --git a/src/rngs/thread.rs b/src/rngs/thread.rs
index b497cb4..d578f71 100644
--- a/src/rngs/thread.rs
+++ b/src/rngs/thread.rs
@@ -55,7 +55,7 @@
 /// [`StdRng`]: crate::rngs::StdRng
 #[derive(Copy, Clone, Debug)]
 pub struct ThreadRng {
-    // type if neither Send nor Sync
+    // type is neither Send nor Sync
     _phantom: PhantomData<*const ()>,
 }