Apparently, the added pages will document their lives since quitting their roles as Senior Royals.
However, Palace insider and biographer Duncan Larcombe has warned it could cause an even bigger wedge between the couple and the rest of the family.
WATCH: Inside Prince Harry And Meghan Markle’s New ‘Normal Life’…
The expert told Closer magazine: “If more negative information comes out about the royals, or in-depth details of any personal conversations between Harry and his family after the funeral are revealed, that really will be the final straw.
“That’ll be it – there will be no chance of reconciliation ever and all trust will be broken.
“How could anyone from the Royal Family trust them again if the intimate details of conversations were leaked?”
A senior courtier explained to the publication: “The Oprah interview detonated a bomb under the Royal Family and most of them are still reeling in shock. The book will not help.”
‘Finding Freedom’ isn’t the only book that has been released by the Duke and Duchess of Sussex.
Meghan has recently confirmed that she will be publishing a kids’ book about a father’s bond with his child.
However, the announcement has been slammed by Piers Morgan.
The ex-Good Morning Britain host said it was ‘hypocritical’ of the 39-year-old to write a story about a relationship with a father since she does not speak to her own.
In his column for the Daily Mail, he remarked: “The whole notion of Meghan Markle dishing out advice to anyone about the relationship between fathers and children is absolutely ridiculous given the appalling relationships she and her husband have with their own fathers.”