diff --git a/completions/_decman b/completions/_decman
new file mode 100644
index 0000000..ba201cd
--- /dev/null
+++ b/completions/_decman
@@ -0,0 +1,14 @@
+#compdef decman
+# zsh completion for decman
+
+_arguments -s \
+  '--source=[python file containing configuration]:config file:_files' \
+  '--dry-run[print what would happen as a result of running decman]' \
+  '--print[print what would happen as a result of running decman]' \
+  '--debug[show debug output]' \
+  '--skip=[skip the following execution steps]:step(s):*' \
+  '--only=[run only the following execution steps]:step(s):*' \
+  '--no-hooks[don'\''t run hook methods for modules]' \
+  '--no-color[don'\''t print messages with color]' \
+  '--params=[additional parameters passed to plugins]:param(s):*' \
+  '--help[show help]'
diff --git a/completions/decman.bash b/completions/decman.bash
new file mode 100644
index 0000000..5d2a1b3
--- /dev/null
+++ b/completions/decman.bash
@@ -0,0 +1,30 @@
+# bash completion for decman
+
+_decman() {
+    local cur prev opts
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+    opts="--source --dry-run --print --debug --skip --only --no-hooks --no-color --params --help"
+
+    case "$prev" in
+        --source)
+            # file completion
+            COMPREPLY=( $(compgen -f -- "$cur") )
+            return 0
+            ;;
+        --skip|--only|--params)
+            # free-form list
+            return 0
+            ;;
+    esac
+
+    if [[ "$cur" == --* ]]; then
+        COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
+        return 0
+    fi
+
+    return 0
+}
+complete -F _decman decman
diff --git a/completions/decman.fish b/completions/decman.fish
new file mode 100644
index 0000000..855c3a2
--- /dev/null
+++ b/completions/decman.fish
@@ -0,0 +1,11 @@
+# fish completion for decman
+
+complete -c decman -l source   -r -d "python file containing configuration" -a "(__fish_complete_path)"
+complete -c decman -l dry-run     -d "print what would happen as a result of running decman"
+complete -c decman -l print       -d "print what would happen as a result of running decman"
+complete -c decman -l debug       -d "show debug output"
+complete -c decman -l skip     -r -d "skip the following execution steps"
+complete -c decman -l only     -r -d "run only the following execution steps"
+complete -c decman -l no-hooks    -d "don't run hook methods for modules"
+complete -c decman -l no-color    -d "don't print messages with color"
+complete -c decman -l params   -r -d "additional parameters passed to plugins"