Add another link.
@@ -52,7 +52,7 @@ obtained by running [`kgtk filter`](https://../filter) to provide the input to `
`kgtk unique` normally builds an in-memory dictionary of the unique
values and counts. Performance will be poor, and execution may fail, if there
are a very large number of unique values, causing main memory to be exhausted.
-If you run out of main memory, you should presort the input file and use
+If you run out of main memory, you should presort the input file with [`kgtk sort`](https://../sort) and use
`kgtk unique --presorted` to avoid building the in-memory dictionary.
## Usage
