diff --git a/man/rmdhunks/rxode2-create-models.Rmd b/man/rmdhunks/rxode2-create-models.Rmd
index d71ccf870..17e6c3fdf 100644
--- a/man/rmdhunks/rxode2-create-models.Rmd
+++ b/man/rmdhunks/rxode2-create-models.Rmd
@@ -1,8 +1,8 @@
-The ODE-based model specification may be coded inside four places: 
+The ODE-based model specification may be coded inside four places:
 
 - Inside a `rxode2({})` block statements:
 
-```{r modBracket}
+``` r
 library(rxode2)
 mod <- rxode2({
   # simple assignment
@@ -15,7 +15,7 @@ mod <- rxode2({
 
 - Inside a `rxode2("")` string statement:
 
-```{r modString}
+``` r
 mod <- rxode2("
   # simple assignment
   C2 <- centr/V2
@@ -27,7 +27,7 @@ mod <- rxode2("
 
 - In a file name to be loaded by rxode2:
 
-```{r modFile} 
+``` r
 writeLines("
   # simple assignment
   C2 <- centr/V2
@@ -38,10 +38,10 @@ writeLines("
 mod <- rxode2(filename='modelFile.rxode2')
 unlink("modelFile.rxode2")
 ```
-  
+
 - In a model function which can be parsed by `rxode2`:
 
-```{r modFun}
+``` r
 mod <- function() {
   model({
     # simple assignment
@@ -94,10 +94,10 @@ For the last type of model (a model function), a call to `rxode2`
 creates a parsed `rxode2` ui that can be translated to the `rxode2`
 compilation model.
 
-```{r}
+``` r
 mod$simulationModel
 
-# or 
+# or
 mod$simulationIniModel
 ```
 
diff --git a/vignettes/rxode2-syntax.Rmd b/vignettes/rxode2-syntax.Rmd
index 3583a590f..d356a8394 100644
--- a/vignettes/rxode2-syntax.Rmd
+++ b/vignettes/rxode2-syntax.Rmd
@@ -17,7 +17,7 @@ knitr::opts_chunk$set(
 
 ## Introduction
 
-This briefly describes the syntax used to define models 
+This briefly describes the syntax used to define models
 that `rxode2` will translate into R-callable compiled code. It also
 describes the communication of variables between `R` and the
 `rxode2` modeling specification.
@@ -35,7 +35,7 @@ describes the communication of variables between `R` and the
 
 ## Bugs and/or deficiencies
 
-- The modulo operator `%%` is currently unsupported. 
+- The modulo operator `%%` is currently unsupported.
 
 ## Note
 
@@ -49,10 +49,10 @@ Below is a commented example to quickly show the capabilities of
 
 ## Example
 
-```{r}
+``` r
 f <- function() {
   ini({
-    
+
   })
   model({
     # An rxode2 model specification (this line is a comment).
@@ -86,18 +86,18 @@ via the `d/dt(identifier)` operator as part of the model specification,
 and which are model parameters via the `params=` argument in `rxode2`
 `solve()` method:
 
-```
+``` r
 m1 <- rxode2(model = ode, modName = "m1")
 
 # model parameters -- a named vector is required
-theta <- 
+theta <-
    c(KA=0.29, CL=18.6, V2=40.2, Q=10.5, V3=297, Kin=1, Kout=1, EC50=200)
 
 # state variables and their amounts at time 0 (the use of names is
 # encouraged, but not required)
 inits <- c(depot=0, centr=0, peri=0, eff=1)
 
-# qd1 is an eventTable specification with a set of dosing and sampling 
+# qd1 is an eventTable specification with a set of dosing and sampling
 # records (code not shown here)
 
 solve(theta, event = qd1, inits = inits)