The phrase "adds to the notion" is correct and usable in written English.
It can be used when you want to indicate that something contributes to or reinforces a particular idea or concept.
Example: "The recent findings in the study add to the notion that climate change is accelerating at an alarming rate."
Alternatives: "contributes to the idea" or "supports the concept".
The eerie abundance of recent Singer publications -- and there have been many since his death -- only adds to the notion that the author is still traveling between worlds.
New recruits are often told to keep it a secret and only tell others they recruit, which adds to the notion that they're all part of a secret winners' club.
It also adds to the notion that, after all these years, the band might suddenly be in step with a wider audience, their lived-in feel right for more difficult times.
All of which also certainly adds to the truth of his portrayal of the dysfunctional family - adds to the notion that this is one of the truest books about family we have.
This adds to the notion that IgE does not affect FcεRI expression on neutrophils [24], [25].
The recent finding that podocin through cholesterol recruitment provides mechanosensitive properties to ion channels such as TRPC6, adds to the notion that the podocyte slit diaphragm relates information into podocyte foot processes [10], [22], [23].
It added to the notion that Prince's music came from an inexhaustible purple fountain, perhaps from heaven itself.
People standing on the street would not see them at work, perhaps adding to the notion that nothing was being done, he said.
In defending his World Boxing Council, International Boxing Federation and World Boxing Association championship belts at the Staples Center tonight, his opponent, Julio Gonzalez, added to the notion that Jones now fights only stiffs with half his skill level to protect his record and legend.
The negative headlines that come along with the Silk Road trial, or with other bad news like the breach of bitcoin exchange BitStamp early this year, fuel wariness and add to the notion that many in the public still have: bitcoin is an unstable investment, it's unsafe, and it is used for crime.
