diff --git a/zsh/_sti b/zsh/_sti
new file mode 100644
index 0000000..637d987
--- /dev/null
+++ b/zsh/_sti
@@ -0,0 +1,56 @@
+#compdef sti
+# sti --- Stupid Tool Installer
+# Copyright (C) 2014  Tom Willemse <tom@ryuslash.org>
+
+# sti is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+
+# sti is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+# License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with sti.  If not, see <http://www.gnu.org/licenses/>.
+
+local expl
+local -a sti_tools _sti_commands
+
+get_tools() {
+  if [[ "$state" == tools ]]; then
+    sti_tools=(${(f)"$(_call_program sti_tools \
+        sti list | awk '{ print $1 }' 2>/dev/null)"})
+    _wanted sti_tools expl 'enabled tools' compadd -a sti_tools
+  fi
+}
+
+_sti_commands=(
+  'help:show help message'
+  'install:install a tool from a git repository'
+  'list:list downloaded tools'
+  'reinit:retry installing the executables of a tool'
+  'remove:remove an installed tool'
+  'update:update an installed tool'
+)
+
+_arguments '*:: :->subcmds' && return 0
+
+if (( CURRENT == 1 )); then
+  _describe -t commands "sti command" _sti_commands
+  return
+fi
+
+case "$words[1]" in
+  h*)
+    _describe -t commands "sti subcommands" _sti_commands
+    return 0 ;;
+  i* | l* )
+    _arguments && return 0 ;;
+  r* | u*)
+    _arguments '*:: :->tools' && return 0
+    get_tools ;;
+esac
+
+# vim: set ft=zsh et ts=2 sw=2 sts=2: