doc: specify that the terminal emulator must be configured to use the patched font

Author: alex-courtis

README.md

@@ -30,7 +30,7 @@ Take a look at the [wiki](https://github.com/nvim-tree/nvim-tree.lua/wiki) for S
 
 [neovim >=0.7.0](https://github.com/neovim/neovim/wiki/Installing-Neovim)
 
-[nvim-web-devicons](https://github.com/nvim-tree/nvim-web-devicons) is optional and used to display file icons. It requires a [patched font](https://www.nerdfonts.com/).
+[nvim-web-devicons](https://github.com/nvim-tree/nvim-web-devicons) is optional and used to display file icons. It requires a [patched font](https://www.nerdfonts.com/). Your terminal emulator must be configured to use that font, usually "Hack Nerd Font"
 
 ## Install
 

doc/nvim-tree-lua.txt

@@ -31,7 +31,9 @@ Features
 
 File Icons
 
-    https://github.com/nvim-tree/nvim-web-devicons is optional and used to display file icons. It requires a patched font: https://www.nerdfonts.com
+    https://github.com/nvim-tree/nvim-web-devicons is optional and used to display file icons.
+    It requires a patched font: https://www.nerdfonts.com
+    Your terminal emulator must be configured to use that font, usually "Hack Nerd Font"
 
      should look like an open folder.