diff --git a/guide/english/c/for/index.md b/guide/english/c/for/index.md
index c926ddc605..762b768487 100644
--- a/guide/english/c/for/index.md
+++ b/guide/english/c/for/index.md
@@ -42,6 +42,8 @@ int main () {
 }
 ```
 
+- It should be noted that the value of `i` is set to `0` because arrays are indexed from `0` to `size-1`, and we want to print the first value as well
+
 #### Output:
 ```shell
 > Item on index 0 is 1