diff --git a/dev/running_r_or_shell_code_in_nix_from_r.Rmd b/dev/running_r_or_shell_code_in_nix_from_r.Rmd
index b545dbc7..c4b0aef8 100644
--- a/dev/running_r_or_shell_code_in_nix_from_r.Rmd
+++ b/dev/running_r_or_shell_code_in_nix_from_r.Rmd
@@ -129,7 +129,7 @@ as.vector(x = df, mode ="list")
 This is is different for R versions 4.1.3 and below, where you should get an
 identical data frame back.
 
-### Run functioned up code and investigate results produced in pure Nix R software environments
+### Run functioned up code and investigate results produced in pure Nix Rsoftware environments
 
 To formally validate in a 'System-to-Nix' approach that the object returned from
 `as.vector.data.frame()` is before `R` \< 4.2.0, we define a function that runs
@@ -306,7 +306,7 @@ software packages available from the community.
 There was a change introduce in {stringr} 1.5.0; in earlier versions, this
 line of code:
 
-```{r, eval = F}
+```{r, eval=FALSE}
 stringr::str_subset(c("", "a"), "")
 ```
 
@@ -314,7 +314,7 @@ would return the character `"a"`. However, this behaviour is unexpected:
 it really should return an error. This was addressed in versions after
 1.5.0:
 
-```{r, eval = F}
+```{r, eval=FALSE}
 out_system_stringr <- tryCatch(
   expr = {stringr::str_subset(c("", "a"), "")},
   error = function(e)NULL)
@@ -324,11 +324,11 @@ Since the code returns an error, we wrap it inside `tryCatch()` and return
 `NULL` instead of an error (if we wouldn't do that, this vignette could not
 compile!).
 
-Let's build a sub-shell with the latest version of R, but an older version
+Let's build a subshell with the latest version of R, but an older version
 of `{stringr}`:
 
 
-```{r, eval = F}
+```{r, eval=FALSE}
 library("rix")
 path_env_stringr <- file.path(".", "_env_stringr_1.4.1")
 
@@ -341,10 +341,10 @@ init(
 list.files(path = path_env_stringr, all.files = TRUE)
 ```
 
-The call below generates a `default.nix` file for the sub-shell with the
+The call below generates a `default.nix` file for the subshell with the
 old version of `{stringr}`:
 
-```{r, eval = F}
+```{r, eval=FALSE}
 rix(
   r_ver = "latest",
   r_pkgs = "stringr@1.4.1",
@@ -353,9 +353,9 @@ rix(
 )
 ```
 
-We can now run the code in the sub-shell
+We can now run the code in the subshell
 
-```{r, eval = F}
+```{r, eval=FALSE}
 out_nix_stringr <- with_nix(
   expr = function() stringr::str_subset(c("", "a"), ""),
   program = "R",
@@ -382,7 +382,7 @@ We can now compare the two: the result of the code running in our main session
 with the latest version of `{stringr}` and the result of the code running in the
 sub-shell with the old version of `{stringr}`:
 
-```{r, eval = F}
+```{r, eval=FALSE}
 identical(out_system_stringr, out_nix_stringr)
 ```
 
diff --git a/vignettes/running-r-or-shell-code-in-nix-from-r.Rmd b/vignettes/running-r-or-shell-code-in-nix-from-r.Rmd
index a3e3245a..1c306c38 100644
--- a/vignettes/running-r-or-shell-code-in-nix-from-r.Rmd
+++ b/vignettes/running-r-or-shell-code-in-nix-from-r.Rmd
@@ -340,7 +340,7 @@ There was a change introduce in {stringr} 1.5.0; in earlier versions, this
 line of code:
 
 
-```{r eval = F}
+```{r eval = FALSE}
 stringr::str_subset(c("", "a"), "")
 ```
 
@@ -349,7 +349,7 @@ it really should return an error. This was addressed in versions after
 1.5.0:
 
 
-```{r eval = F}
+```{r eval = FALSE}
 out_system_stringr <- tryCatch(
   expr = {stringr::str_subset(c("", "a"), "")},
   error = function(e)NULL)
@@ -359,12 +359,12 @@ Since the code returns an error, we wrap it inside `tryCatch()` and return
 `NULL` instead of an error (if we wouldn't do that, this vignette could not
 compile!).
 
-Let's build a sub-shell with the latest version of R, but an older version
+Let's build a subshell with the latest version of R, but an older version
 of `{stringr}`:
 
 
 
-```{r eval = F}
+```{r eval = FALSE}
 library("rix")
 path_env_stringr <- file.path(".", "_env_stringr_1.4.1")
 
@@ -377,11 +377,11 @@ init(
 list.files(path = path_env_stringr, all.files = TRUE)
 ```
 
-The call below generates a `default.nix` file for the sub-shell with the
+The call below generates a `default.nix` file for the subshell with the
 old version of `{stringr}`:
 
 
-```{r eval = F}
+```{r eval = FALSE}
 rix(
   r_ver = "latest",
   r_pkgs = "stringr@1.4.1",
@@ -390,10 +390,10 @@ rix(
 )
 ```
 
-We can now run the code in the sub-shell
+We can now run the code in the subshell
 
 
-```{r eval = F}
+```{r eval = FALSE}
 out_nix_stringr <- with_nix(
   expr = function() stringr::str_subset(c("", "a"), ""),
   program = "R",
@@ -422,7 +422,7 @@ with the latest version of `{stringr}` and the result of the code running in the
 sub-shell with the old version of `{stringr}`:
 
 
-```{r eval = F}
+```{r eval = FALSE}
 identical(out_system_stringr, out_nix_stringr)
 ```