diff --git a/install.zsh b/install.zsh
old mode 100644
new mode 100755
index c0c9bbc..7f78bc4
--- a/install.zsh
+++ b/install.zsh
@@ -1,5 +1,13 @@
 #!/usr/bin/env zsh
 # env, because some OSes keep zsh in /bin (I'm looking at you, Alpine)
+if [[ "$1" == "update" ]]; then
+  cp .zshrc $HOME
+  if [ -d "${HOME}/.zsh" ]; then
+    rm -r $HOME/.zsh
+  fi
+  cp -r .zsh $HOME
+  exit
+fi
 cp .zshrc $HOME
 if [ ! -d "${HOME}/.oh-my-zsh" ]; then
   sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"