diff --git a/exercises/20_threads/threads1.rs b/exercises/20_threads/threads1.rs
index 01f9ff44..dbc64b16 100644
--- a/exercises/20_threads/threads1.rs
+++ b/exercises/20_threads/threads1.rs
@@ -1,5 +1,5 @@
-// This program spawns multiple threads that each run for at least 250ms, and
-// each thread returns how much time they took to complete. The program should
+// This program spawns multiple threads that each runs for at least 250ms, and
+// each thread returns how much time it took to complete. The program should
 // wait until all the spawned threads have finished and should collect their
 // return values into a vector.
 
diff --git a/solutions/20_threads/threads1.rs b/solutions/20_threads/threads1.rs
index 7f3dd29a..1fc5bc9c 100644
--- a/solutions/20_threads/threads1.rs
+++ b/solutions/20_threads/threads1.rs
@@ -1,5 +1,5 @@
-// This program spawns multiple threads that each run for at least 250ms, and
-// each thread returns how much time they took to complete. The program should
+// This program spawns multiple threads that each runs for at least 250ms, and
+// each thread returns how much time it took to complete. The program should
 // wait until all the spawned threads have finished and should collect their
 // return values into a vector.