Print size of directory content with tree command in tree 1.5?

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http://unix.stackexchange.com – I like tree it's a nice way to display my files and the size of folders/directories. But the -h option only shows the size of the directory, not it's contents. /media/ ├── [ 16K] 64D9-E862 │   ├── [8.0K] downloads I know for a fact that my external drive has more that 16kB in it. How can I fix that with tree 1.5? Better yet how do I upgrade to 1.6? (HowTos)