diff --git a/guide/english/cplusplus/while-loop/index.md b/guide/english/cplusplus/while-loop/index.md
index 17a3d6d23b..cf18f9eb93 100644
--- a/guide/english/cplusplus/while-loop/index.md
+++ b/guide/english/cplusplus/while-loop/index.md
@@ -2,7 +2,7 @@
 title: While-loop
 ---
 
-A while loop statement repeatedly executes a target statement as long as a given condition is true.
+A while loop statement repeatedly executes a target statement as long as a given condition is true. It is often used when the number of iterations is unknown.
 
 Syntax:
 ```C++