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+## Generating Zsh Completion for your cobra.Command
+
+Cobra supports native Zsh completion generated from the root `cobra.Command`.
+The generated completion script should be put somewhere in your `$fpath` named
+`_<YOUR COMMAND>`.
+
+### What's Supported
+
+* Completion for all non-hidden subcommands using their `.Short` description.
+* Completion for all non-hidden flags using the following rules:
+ * Filename completion works by marking the flag with `cmd.MarkFlagFilename...`
+ family of commands.
+ * The requirement for argument to the flag is decided by the `.NoOptDefVal`
+ flag value - if it's empty then completion will expect an argument.
+ * Flags of one of the various `*Array` and `*Slice` types supports multiple
+ specifications (with or without argument depending on the specific type).
+* Completion of positional arguments using the following rules:
+ * Argument position for all options below starts at `1`. If argument position
+ `0` is requested it will raise an error.
+ * Use `command.MarkZshCompPositionalArgumentFile` to complete filenames. Glob
+ patterns (e.g. `"*.log"`) are optional - if not specified it will offer to
+ complete all file types.
+ * Use `command.MarkZshCompPositionalArgumentWords` to offer specific words for
+ completion. At least one word is required.
+ * It's possible to specify completion for some arguments and leave some
+ unspecified (e.g. offer words for second argument but nothing for first
+ argument). This will cause no completion for first argument but words
+ completion for second argument.
+ * If no argument completion was specified for 1st argument (but optionally was
+ specified for 2nd) and the command has `ValidArgs` it will be used as
+ completion options for 1st argument.
+ * Argument completions only offered for commands with no subcommands.
+
+### What's not yet Supported
+
+* Custom completion scripts are not supported yet (We should probably create zsh
+ specific one, doesn't make sense to re-use the bash one as the functions will
+ be different).
+* Whatever other feature you're looking for and doesn't exist :)