diff --git a/.github/workflows/r.yml b/.github/workflows/r.yml
index 30fdb3b..b9d7622 100644
--- a/.github/workflows/r.yml
+++ b/.github/workflows/r.yml
@@ -49,6 +49,8 @@ jobs:
         with:
           extra-packages: rcmdcheck
       - uses: r-lib/actions/check-r-package@v2
+        with:
+          error-on: '"error"'
       
       - name: Set up R  ${{ matrix.config.r }}
         uses: r-lib/actions/setup-r@v2
diff --git a/README.md b/README.md
index 0dded2d..6acb935 100644
--- a/README.md
+++ b/README.md
@@ -466,7 +466,7 @@ Multiple samples and replicates can be handled and visualized according to diffe
 			example_length_dist[["plot_Samp2"]]
 	<p align="center">
 	<img src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_1_1.png" width="300" />
-	src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_1_2.png" width="300" />
+	<img src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_1_2.png" width="300" />
 	</p>
 
 	* According to *plot_style = "facet"* the two distributions are arranged in two independent boxes.
@@ -549,7 +549,7 @@ Multiple samples and replicates can be handled and visualized according to diffe
 			example_length_dist[["plot_S2"]]
 	<p align="center">
 	<img src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_rep2_1_1.png" width="300" />
-	src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_rep2_1_2.png" width="300" />
+	<img src="https://github.com/LabTranslationalArchitectomics/riboWaltz/blob/master/vignettes/example_length_dist_rep2_1_2.png" width="300" />
 	</p>
 
 	* Three samples, two with multiple replicates and one with no replicates, *plot_style = "dodge"*.