diff --git a/a2/program.c b/a2/program.c
index c44595b..11d5821 100644
--- a/a2/program.c
+++ b/a2/program.c
@@ -9,7 +9,7 @@ struct stack{
     int size;
 }stack;
 
-///add bracket to stack
+///add bracket to stack and increment size
 
 void push(char ch){
     if(stack.size < 100){
@@ -102,7 +102,7 @@ int main(){
             }
             else{
                  c_bracket[f] = 0;                     //if closing bracket is correct then reducee array
-                 f--;                                  //if i didn't find a correct bracket, then keep it in the array
+                 f--;                                  //if i didn't find a correct bracket, then keep it in the array c_bracket
                  pop();
             }
         }
diff --git a/cv1/program.c b/cv1/program.c
index 4745d9b..4860371 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -9,6 +9,8 @@ struct pizza{
     float prize;
 };
 
+//read menu
+
 int read_pizza(struct pizza* item){
    
     char line1[LINESIZE];
@@ -16,19 +18,22 @@ int read_pizza(struct pizza* item){
  
     memset(line1, 0, LINESIZE);
     memset(line2, 0, LINESIZE);
-    char *l1 = fgets(line1,LINESIZE,stdin);
-    char *l2 = fgets(line2,LINESIZE,stdin);
-    float value = strtof(line2, &l2);
+    char *l1 = fgets(line1,LINESIZE,stdin); //read first line(name)
+    char *l2 = fgets(line2,LINESIZE,stdin); //read second line(price)
+    float value = strtof(line2, &l2);       //change char to float, because price is a nummber
     if(value == 0.0F){
        return 0;
     }
-    if(l1 != NULL && line1[1] != 0){
+    if(l1 != NULL && line1[1] != 0){        //check if array with name is not empty
         item->prize = value;
         strcpy(item->name, line1);
         return 1;   
     }   
 }
 
+//check every place where the string might be
+//if there isn't at first place, go to the second etc.
+
 int search_string(const char* heap, const char* needle){
 
     int H = strlen(heap);
@@ -100,11 +105,14 @@ int main(){
     int i, j;
     for(i = 0; i < counter; i++){
         for(j = 0; j < strlen(jedalny_listok[i].name); j++){
+            //change menu with help of hacher_script
             pomocny[i].name[j] = hacker_script(jedalny_listok[i].name[j]);
 
         }
+        //check if there is key in the menu 
         int result = search_string(pomocny[i].name, key);
         if(result != -1){
+            //if there is a key, print name and price
             printf("%s", jedalny_listok[i].name);
             printf("%.2f\n", jedalny_listok[i].prize);
         }
diff --git a/cv5/a_train.h b/cv5/a_train.h
index 4088b1d..0297dfa 100644
--- a/cv5/a_train.h
+++ b/cv5/a_train.h
@@ -40,7 +40,7 @@ void print_train(struct car* first);
  * Zrusenie vsetkych voznov vo vlaku.
  * @arg smernik na prvy vozen
  */
-void cancel_train(struct car* first, int val);
+void cancel_train(struct car* first);
 
 /**
  * Vyradenie vsetkych voznov, ktorych cielova stanica je target