diff --git a/libexec/swiftenv-init b/libexec/swiftenv-init
index 9c8dd8f..c7d7316 100755
--- a/libexec/swiftenv-init
+++ b/libexec/swiftenv-init
@@ -1,7 +1,18 @@
 #!/usr/bin/env bash
+# completes
 
 set -e
 
+if [ "$1" = "--complete" ]; then
+  echo "-"
+  echo "--no-rehash"
+  echo "--rehash"
+  echo "bash"
+  echo "zsh"
+  echo "fish"
+  exit
+fi
+
 print=""
 
 if [ -r "$SWIFTENV_ROOT/shims" ]; then