diff --git a/Makefile b/Makefile
index d50d5bb..030e970 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+# This is based on Textern’s Makefile (https://github.com/jlebon/textern)
ifneq ($(USER),1)
PREFIX ?= /usr/local
MOZILLA_PREFIX ?= /usr
@@ -38,4 +39,4 @@ native-uninstall:
.PHONY: xpi
xpi:
- @rm -f shellfox.xpi && zip -r shellfox.xpi background.js _locales/ manifest.json options.* res/*.png
+ @rm -f shellfox.xpi && zip -r shellfox.xpi background.js _locales/ manifest.json options.* res/shell*.png
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5f7ccc8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,28 @@
+#  Shellfox
+
+[Shellfox](https://hak.xwx.moe/jadedctrl/shellfox) is a simple add-on for [Firefox](https://firefox.com) that allows you to run shell commands at the click of a button.
+
+
+
+
+## Installation
+Shellfox uses a native program in order to run commands; installing only the add-on isn’t enough. Currently, the native program has only been tested on GNU/Linux, though it is likely to work on BSDs, and potentially macOS.
+
+First, download the repository: [shellfox.zip](https://hak.xwx.moe/jadedctrl/shellfox/archive/master.zip)
+
+Then, in the repository’s directory, open a terminal and run:
+
+```
+$ sudo make native-install
+```
+
+After that, you can install the add-on; then, voilà!
+
+
+## Related projects
+This add-on was inspired by [Textern](https://github.com/jlebon/textern/), which allows you to edit text-boxes with an external editor like [Emacs](https://gnu.org/software/emacs). It’s very useful, I highly recommend it!
+
+## Source code
+https://hak.xwx.moe/jadedctrl/shellfox
+Author is Jaidyn Ann,
+License is the [GNU GPLv3](LICENSE).
diff --git a/res/screenshot-youtube.png b/res/screenshot-youtube.png
new file mode 100644
index 0000000..0274532
Binary files /dev/null and b/res/screenshot-youtube.png differ