diff --git a/exercises/09_strings/strings3.rs b/exercises/09_strings/strings3.rs
index b29f9325..b5bc1077 100644
--- a/exercises/09_strings/strings3.rs
+++ b/exercises/09_strings/strings3.rs
@@ -11,7 +11,7 @@ fn trim_me(input: &str) -> String {
 }
 
 fn compose_me(input: &str) -> String {
-    // TODO: Add " world!" to the string! There's multiple ways to do this!
+    // TODO: Add " world!" to the string! There're multiple ways to do this!
     ???
 }