Here are some examples of how it can be used:
* "Si un petit peu d'eau est ajoutée, la pâte deviendra plus facile à travailler." (If just a little water is added, the dough will become easier to work with.)
* "Si un petit peu de soleil nous éclaire, la journée sera plus agréable." (If just a little sunshine illuminates us, the day will be more pleasant.)
Essentially, it conveys the idea of something being added in a small amount, potentially making a noticeable difference.