diff --git a/README.md b/README.md
index ddd2a304f7ffb5539face5516b20e4c295d72ecc..3bbfd38858bd7f9b1b434575af71dae389713881 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ $ pip install -r requirements.txt
 
 ```console
 $ pip list -o
-$ pip install --upgrade <package
+$ pip install --upgrade package
 $ pip freeze | sed '/pkg-resources==/d' > requirements.txt
 ```
 
diff --git a/docs.it4i/modules-matrix.md b/docs.it4i/modules-matrix.md
index 88c72e4a8982ca1579820fd45a2cf80ba8d3ca4f..97cfaec67beabde9836ca944cea1a20280fec1d9 100644
--- a/docs.it4i/modules-matrix.md
+++ b/docs.it4i/modules-matrix.md
@@ -1,5 +1,12 @@
 !!! Hint "Cluster Acronyms"
-    A - Anselm • S - Salomon • U - uv1 at Salomon
+
+    ```
+    USA
+    |||
+    ||+---->Anselm
+    |+----->Salomon
+    +------>UV2000
+    ```
 
 | Module </br><form><input id="searchInput" placeholder="🔍 Filter" style="width: 8rem; border-radius: 0.2rem; color: black; padding-left: .2rem;"></form> | Versions | Clusters |
 | ------ | -------- | -------- |
diff --git a/requirements.txt b/requirements.txt
index 6fe1e35bcc0daf467b9930a57acfa7a08b11873c..ed2036e67a6cd23da7e9168bd57ce2f730cbc3f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ livereload==2.6.0
 Markdown==3.0.1
 MarkupSafe==1.1.0
 mkdocs==1.0.4
-mkdocs-material==3.3.0
+mkdocs-material==4.0.1
 Pygments==2.3.1
 pymdown-extensions==6.0
 PyYAML==3.13
diff --git a/scripts/modules-matrix.py b/scripts/modules-matrix.py
index 939a10ad0a350b350a53fcde202192de8258a06e..70cb5118d9cad48b9123563246f94ed4ddbdc607 100755
--- a/scripts/modules-matrix.py
+++ b/scripts/modules-matrix.py
@@ -40,7 +40,13 @@ c=[
 ]
 
 print '!!! Hint "Cluster Acronyms"'
-print '    A - Anselm • S - Salomon • U - uv1 at Salomon'
+print '    ```'
+print '    USA'
+print '    |||'
+print '    ||+---->Anselm'
+print '    |+----->Salomon'
+print '    +------>UV2000'
+print '    ```'
 print
 print '| Module </br><form><input id="searchInput" placeholder="🔍 Filter" style="width: 8rem; border-radius: 0.2rem; color: black; padding-left: .2rem;"><form> | Versions | Clusters |'
 print "| ------ | -------- | -------- |"