We found one dictionary that defines the word knowledgeable about:

Phrases: knowledgeable about current events, more... ▸ Words similar to knowledgeable about ▸ Usage examples for knowledgeable about ▸ Idioms related to knowledgeable about ▸ Wikipedia articles (New!) ▸ Words that often appear near knowledgeable about ▸ Rhymes of knowledgeable about ▸ Invented words related to knowledgeable about