Add What Is On The Runtime Path? as a vim til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_526 TILs and counting..._
+_527 TILs and counting..._
 
 ---
 
@@ -615,6 +615,7 @@ _526 TILs and counting..._
 - [View Commit History of a File](vim/view-commit-history-of-a-file.md)
 - [Viewing Man Pages with man.vim](vim/viewing-man-pages-with-man-vim.md)
 - [Vim Without The Extras](vim/vim-without-the-extras.md)
+- [What Is On The Runtime Path](vim/what-is-on-the-runtime-path.md)
 - [Whole Line Auto-Completion](vim/whole-line-auto-completion.md)
 - [Wrap With Some Room](vim/wrap-with-some-room.md)
 

vim/what-is-on-the-runtime-path.md

@@ -0,0 +1,26 @@
+# What Is On The Runtime Path?
+
+All of the plugins, syntax highlighting, language-specific indentation that
+extend the default behavior of Vim are on the runtime path. If something
+isn't on Vim's runtime path, then Vim won't know about and as a result will
+not load it at _runtime_.
+
+How do we see what is on the runtime path?
+
+The `rtp` option is the shorthand for `runtimepath`. Calling `set` on either
+of these will show us the list of runtime paths, or at least some of them.
+
+```
+:set rtp
+```
+
+This will generally be a truncated list if you have a lot of plugins. To be
+sure you are seeing all of them, use `echo` instead.
+
+```
+:echo &rtp
+```
+
+See `:h rtp` for more details.
+
+h/t Chris Erin