diff --git a/docs/cli/diff.md b/docs/cli/diff.md
new file mode 100644
index 0000000..983159d
--- /dev/null
+++ b/docs/cli/diff.md
@@ -0,0 +1,12 @@
+---
+tags:
+  - diff
+---
+
+# See difference between files / directories
+
+```bash
+diff -ry dir1 dir2
+```
+
+The `-r` flag is to recurse into folders. The `-y` flag creates a side by side view, generally easier to read. `-q` Would only show what filenames changed.