diff --git a/guide/english/c/for/index.md b/guide/english/c/for/index.md
index 4417d7a3ea..79ddc7f5db 100644
--- a/guide/english/c/for/index.md
+++ b/guide/english/c/for/index.md
@@ -16,7 +16,6 @@ for ( initialization; condition; update ) {
    statement(s);
 }
 ```
-
 The `for` loop consists of 3 sections:
    1. The initialization section (start value)
    2. Condition (stop value)
@@ -24,6 +23,11 @@ The `for` loop consists of 3 sections:
 
 The initialization statement is executed only once. Then, the condition is evaluated. If the condition is false (0), the `for` loop is terminated. But if the condition is true (nonzero), code inside the block of the `for` loop is executed. Finally, the update expression is executed. This process repeats until the condition is false.
 
+You can leave any of the three field blank:
+- If you leave initialization blank, then there is no initialization phase
+- If you leave update blank, then there is no update phase
+- If you leave the condition blank, then practically it becomes an infinite loop unless you break inside loop
+
 The `for` loop is commonly used when the number of iterations is known.
 
 #### Example