diff --git a/README.md b/README.md
index e8dd38cd..691cbd9d 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,14 @@ $this->handle("text"); // string  -> parameter is left untyped
 go install github.com/rectorphp/argtyper@latest
 ```
 
+Or build from source:
+
+```bash
+git clone https://github.com/rectorphp/argtyper
+cd argtyper
+make build   # produces ./argtyper
+```
+
 ## Usage
 
 ```bash
@@ -116,6 +124,15 @@ argtyper add-types [project-path]
 `project-path` defaults to the current directory. The tool scans the `src`,
 `lib`, `app`, `test` and `tests` directories.
 
+Preview the changes without writing them with `--dry`:
+
+```bash
+argtyper add-types . --dry
+```
+
+It prints the diff of the types that would be added and leaves every file
+untouched.
+
 <br>
 
 ## How it works