PostgreSQL table describe output, what does it mean?

So I get output like this when I do a table describe on a PostgreSQL table.

2, module, varchar, -1, 68, t

I'm guessing 2 is the column number, "module" is the column name, varchar is the datatype, 68 is the length, t is nullable.

Is this correct and what does th开发者_高级运维e -1 signify?

Thanks

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-1 is the "typmod" (type modifier). For most types, -1 means default or unspecified. For varchar, specifically, -1 means unlimited length.