according to my book, they said "Add 10 ml sodium hypochlorite solution (>5% available chloride) and make up to 1000ml" and I'm a little bit confusing the meaning of 'make up to'.

overall protocol is ① Dissolve 30 g sodium hydroxide in 750 ml in DW. ② Add 10 ml sodium hypochlorite solution (>5% available chloride) and make up to 1000ml.

Does it mean I need to add more DW?