diff --git a/docs/index.rst b/docs/index.rst
index 7a2584b..9a95717 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -11,6 +11,7 @@ RTFD
    public/bash/index
    public/bind9/index
    public/c/index
+   public/coreutils/index
    public/curl/index
    public/dd/index
    public/debian/index
diff --git a/docs/public/coreutils/index.rst b/docs/public/coreutils/index.rst
new file mode 100644
index 0000000..5b44b1f
--- /dev/null
+++ b/docs/public/coreutils/index.rst
@@ -0,0 +1,9 @@
+coreutils
+=========
+
+printf
+------
+
+.. code:: shell
+
+ printf -v formatted "%03d" ${raw}