diff --git a/.DS_Store b/.DS_Store
index 7aba0f7..569afa4 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/julia/README.md b/julia/README.md
index 223cd33..91516d5 100644
--- a/julia/README.md
+++ b/julia/README.md
@@ -7,3 +7,5 @@ Run using the standard `ces-run` command without any additional inputs.
 ## Notes
 
 This example contains the script `plot_example.jl`, which generates a plot, and a bash script `run_test.sh` that executes the plot script and then saves the output to `/safe_outputs`. Both files are found under the `src` directory, which is copied inside the container in the `Dockerfile`. The required packages are installed using the `install_packages.jl` script.
+
+Warning: this example takes several minutes to run inside the TRE due to the Plots package being loaded by the script.
diff --git a/julia/src/plot_example.jl b/julia/src/plot_example.jl
index 6f766c5..717cf74 100644
--- a/julia/src/plot_example.jl
+++ b/julia/src/plot_example.jl
@@ -1,4 +1,6 @@
 using Plots
+# prevents figure from attempting to be displayed
+ENV["GKSwstype"]="nul"
 
 # plot some data
 plot([cumsum(rand(500) .- 0.5), cumsum(rand(500) .- 0.5)])
diff --git a/postgres/README.md b/postgres/README.md
index 5a5a723..7833e82 100644
--- a/postgres/README.md
+++ b/postgres/README.md
@@ -10,7 +10,7 @@ This test ran successfully in the eidf147 environment using the following comman
 
 ```bash
 mkdir pgdata pgrun
-ces-run --opt-file opt_file ghcr.io/...
+ces-dk-run --opt-file opt_file ghcr.io/...
 ```
 
 The opt_file contains: