# When should I report multiple r-squared versus adjusted r-squared in a linear regression?

I am trying to report the r-squared value for the results of a linear regression in R using the lm package. I noticed that the summary function provides two r-squared values for my equation: adjusted r-squard and multiple r-squared. In most of the analyses I have run the two values are identical, but in a small minority of results they give different values. Given this, I am trying to figure out in what situations I should report adjusted r-squared and which should I report multiple r-squared. It was my impression that one reports multiple r-squared if they have a multivariate regression, but I was not sure.