A new First World War memorial stone at Gresham's school in Holt includes the names of 15 students and staff who were originally omitted.
At the end of the war the school's newly built chapel was furnished with a memorial board to the students and staff who died fighting.
The names of the extra students and staff who died were discovered during a four-year centenary project.
The original memorial board depicted 99 students and one member of staff and the school now knows the names of 112 students and three members of staff. The school raised £8,000 for the memorial stone.
Simon Kinder, Gresham's head of history, said: 'The names were omitted either as a result of having only been discovered more recently, thanks to further research, or as a result of the students and staff members having moved away to other schools and institutions and therefore being included on memorials elsewhere.'
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here