diff --git a/.lintr b/.lintr
new file mode 100644
index 0000000..a394600
--- /dev/null
+++ b/.lintr
@@ -0,0 +1,4 @@
+linters: with_defaults(
+  line_length_linter(120), 
+  assignment_linter = NULL
+  )
diff --git a/vignettes/si.Rmd b/vignettes/si.Rmd
index fbd8bc7..2f2ef19 100644
--- a/vignettes/si.Rmd
+++ b/vignettes/si.Rmd
@@ -107,7 +107,7 @@ Prepare the OD dataset as follows:
 
 ```{r}
 od_sim = si_to_od(origins = zones, destinations = zones)
-head(od_sim, 2)
+names(od_sim)
 ```
 
 Note that the output has duplicate columns: `si_to_od()` joins data from the origin and destination objects into the resulting OD object.
@@ -119,7 +119,7 @@ A simplistic SIM can be created just based on the distance between points:
 ```{r unconstrained1}
 si_power = function(od, beta) {
   (od[["distance_euclidean"]] / 1000)^beta
-} 
+}
 od_calculate = si_calculate(od_sim, fun = si_power, beta = -0.8)
 plot(od_calculate["res"], logz = TRUE)
 ```