diff --git a/data_structure_lab/substring_identification.c b/data_structure_lab/substring_identification.c
index d0744de..7e85e15 100644
--- a/data_structure_lab/substring_identification.c
+++ b/data_structure_lab/substring_identification.c
@@ -13,7 +13,7 @@ void main()
     printf("enter substring:\n");
     gets(sub);
 
-    count1 = strlen(str);
+    count1 = strlen(str); //Counting length
     count2 = strlen(sub);
 
     for(i=0;i<=count1-count2;i++)