It won't affect the accuracy of the signing content just because you don't tell others.
Generally, it is a birthday or a visa to a temple to protect the health, peace and happiness of family members. When we draw a visa, we don't have to tell anyone. When we get it, we can remember to make a wish at a temple or other places in time.
Many times, asking for a visa is just a comfort. Living a good life and having a correct attitude are more important than anything else.