diff --git a/lectures/27_garbage_collection/README.md b/lectures/27_garbage_collection/README.md
index dfccb62..5a1af22 100644
--- a/lectures/27_garbage_collection/README.md
+++ b/lectures/27_garbage_collection/README.md
@@ -401,7 +401,7 @@ int main(){
 
         std::unique_ptr<std::string> s2(std::move(s1));
 
-        // Question: which of the following line will trigger a seg fault?
+        // Question: which one of the following two lines will trigger a seg fault?
         // std::cout << "s1:" << *s1 << std::endl;
         // std::cout << "s2:" << *s2 << std::endl;
 
diff --git a/lectures/27_garbage_collection/unique_ptr1.cpp b/lectures/27_garbage_collection/unique_ptr1.cpp
index 0997db7..c9083d5 100644
--- a/lectures/27_garbage_collection/unique_ptr1.cpp
+++ b/lectures/27_garbage_collection/unique_ptr1.cpp
@@ -13,7 +13,7 @@ int main(){
 
 	std::unique_ptr<std::string> s2(std::move(s1));
 
-	// Question: which of the following line will trigger a seg fault?
+	// Question: which one of the following two lines will trigger a seg fault?
 	// std::cout << "s1:" << *s1 << std::endl;
 	// std::cout << "s2:" << *s2 << std::endl;