tweak

Author: MichaelChirico

vignettes/datatable-secondary-indices-and-auto-indexing.Rmd

@@ -192,10 +192,12 @@ flights[.("JFK", "LAX"), on = c("origin", "dest")][1:5]
 * Since the time to compute the secondary index is quite small, we don't have to use `setindex()`, unless, once again, the task involves repeated subsetting on the same column.
 
 * For clarity/readability, it might help to name the inputs in `i`, e.g.,
+
 ```{r}
 flights[.(origin = "JFK", dest = "LAX"), on = c("origin", "dest")]
 ```
-This makes it clear which values correspond to which key.
+
+This makes it clear which values correspond to which element of `on`.
 
 ### b) Select in `j`