The verb inform uses of for a second object, as below:

I will inform Mr. Brown of your arrival.

I don't know why of needs to be used here. Could you explain what of means?

  • "of" in this case means about - I will inform Mr. Brown of/about your arrival. – Ben Nov 13 '15 at 3:19

This is a matter of idiom. Some English verbs, usually verbs of giving, take a direct object and a second object called an indirect object.

I gave Mr. Brown your regards.

Some verbs, usually verbs of selection or labeling, take a direct object and a second object called an objective complement.

We elected Mr. Brown mayor.

None of these objects requires a preposition. It's understood that I gave to Mr. Brown and we elected him as mayor.

The verb inform doesn't fall into the classes above, and it requires a prepositional phrase to complete its meaning. Of here means about.

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