Modify a given Python list by adding a certain value to each element.
list = [1, 2, 3, 4, 5] 
value = 10
# Modifying the list by adding 'value' to each element
for i in range(len(list)):
    list[i] = list[i] + value

# Print the modified list
print(list)
# [11, 12, 13, 14, 15]