diff --git a/README.md b/README.md
index c71fdc7..32ca37d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,21 @@
 # imprint
 Secure, signed image rendering for Rails
+
+## Installation
+
+### System dependencies
+
+```bash
+Ubuntu:
+sudo apt install libgd-dev
+```
+
+macOS:
+```bash
+brew install gd
+```
+
+### Gemfile
+```bash
+gem 'imprint'
+```
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