He also questioned as to why the Congress governments did not disclose the files so far.
Singh, who was present during the interaction that Netaji's 35 family members had with Prime Minister Narendra Modi here yesterday, said the decision to declassify the files was "historic" as it will help bring to light many things that have been hidden in the last seven decades.
"The wait of 70 years has come to an end by the historic decision taken by Prime Minister Modi," he said.
There are about 300 files and the first set will be declassified on January 23.
More From This Section
While the government will make public the documents available with it, the Prime Minister will personally take up with leaders of some other countries like Russia, China, Japan, Germany, Britain and Taiwan, urging them to declassify files related to Netaji, he told PTI.
Singh, BJP's secretary in-charge of West Bengal, rejected the perception that the Centre decided to declassify the files "under pressure" as West Bengal's Mamata Banerjee government did so recently.
"Subsequently, a committee headed by the Cabinet Secretary was set up in April-May to study the subject," Singh quoted Modi as saying.
"It is not in our DNA to strangle history," Modi told the family members, according to Singh.