diff --git a/modules/directory/README.md b/modules/directory/README.md
index 6572bb7..4ba8fbf 100644
--- a/modules/directory/README.md
+++ b/modules/directory/README.md
@@ -22,7 +22,11 @@ Aliases
 -------
 
   - `d` prints the contents of the directory stack.
-  - `1 ... 9` changes the directory to the **n** previous one.
+
+Functions
+---------
+
+  - `command_not_found_handler` changes the directory to the **n** previous one.
 
 Authors
 -------
diff --git a/modules/directory/functions/command_not_found_handler b/modules/directory/functions/command_not_found_handler
new file mode 100644
index 0000000..21ce4d9
--- /dev/null
+++ b/modules/directory/functions/command_not_found_handler
@@ -0,0 +1,13 @@
+#
+# Changes the directory to the n previous one.
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+if [[ "$1" == [[:digit:]]## ]]; then
+  builtin cd "+$1"
+else
+  return 127
+fi
+
diff --git a/modules/directory/init.zsh b/modules/directory/init.zsh
index 3be411b..debb045 100644
--- a/modules/directory/init.zsh
+++ b/modules/directory/init.zsh
@@ -27,5 +27,4 @@ unsetopt CLOBBER            # Do not overwrite existing files with > and >>.
 #
 
 alias d='dirs -v'
-for index ({1..9}) alias "$index"="cd +${index}"; unset index