diff --git a/.vscode/settings.json b/.vscode/settings.json
index 0d24e5a..2a8db89 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -121,6 +121,7 @@
         "turris",
         "twrp",
         "uncordon",
+        "userland",
         "usermod",
         "userspace",
         "winget",
diff --git a/knowledge base/gnu userland/README.md b/knowledge base/gnu userland/README.md
new file mode 100644
index 0000000..196e40c
--- /dev/null
+++ b/knowledge base/gnu userland/README.md	
@@ -0,0 +1,37 @@
+# GNU userland
+
+Most operating systems have two distinct parts: the **kernel** and the **userland**.
+
+Most Linux distributions use the [GNU userland][software].<br/>
+It contains system daemons, user applications, the GUI system (X11, KDE, etc.) and various libraries (such as SDL, Mesa, GNUstep, glibc, etc.).
+
+## Table of contents <!-- omit in toc -->
+
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## Further readings
+
+- [Software]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [GNU userland]
+
+<!--
+  References
+  -->
+
+<!-- Upstream -->
+[software]: https://www.gnu.org/software/
+
+<!-- In-article sections -->
+[further readings]: #further-readings
+
+<!-- Knowledge base -->
+[parallel]: parallel.md
+
+<!-- Others -->
+[gnu userland]: https://www.linux.org/threads/gnu-userland.11066/
diff --git a/knowledge base/parallel.md b/knowledge base/gnu userland/parallel.md
similarity index 97%
rename from knowledge base/parallel.md
rename to knowledge base/gnu userland/parallel.md
index 4ba8412..99cf1e0 100644
--- a/knowledge base/parallel.md	
+++ b/knowledge base/gnu userland/parallel.md	
@@ -50,8 +50,8 @@ parallel --tag "magick compare -metric NCC -quiet {} NULL: 2>&1; echo" \
 
 ## Further readings
 
-- GNU Parallel's [man page]
-- GNU Parallel's [tutorial]
+- [`man` page][man page]
+- [Tutorial]
 - [Obtaining exit status values from GNU parallel]
 
 <!--