We found one dictionary that defines the word make improvements to:

Phrases: make improvements or corrections to, more... ▸ Words similar to make improvements to ▸ Usage examples for make improvements to ▸ Idioms related to make improvements to ▸ Wikipedia articles (New!) ▸ Words that often appear near make improvements to ▸ Rhymes of make improvements to ▸ Invented words related to make improvements to