diff --git a/rmarkdown.Rmd b/rmarkdown.Rmd
index 5802edd..89a074b 100644
--- a/rmarkdown.Rmd
+++ b/rmarkdown.Rmd
@@ -354,7 +354,7 @@ params:
 
 In RStudio, you can click the "Knit with Parameters" option in the Knit dropdown menu to set parameters, render, and preview the report in a single user friendly step. You can customise the dialog by setting other options in the header. See <http://rmarkdown.rstudio.com/developer_parameterized_reports.html#parameter_user_interfaces> for more details.
 
-Alternatively, if you need to produce many such paramterised reports, you can call `rmarkdown::render()` with a list of `params`:
+Alternatively, if you need to produce many such parameterised reports, you can call `rmarkdown::render()` with a list of `params`:
 
 ```{r eval = FALSE}
 rmarkdown::render("fuel-economy.Rmd", params = list(my_class = "suv"))