diff --git a/docs/setup/installation.md b/docs/setup/installation.md
index bc9438c..c329ee6 100644
--- a/docs/setup/installation.md
+++ b/docs/setup/installation.md
@@ -25,6 +25,12 @@ go install ./cmd/summer
 summer --help
 ```
 
+`go install` writes the binary to `$(go env GOPATH)/bin`, usually `~/go/bin`. If `summer --help` reports `command not found`, that directory is not on your `PATH`. Add it for the current shell, and to your shell profile to keep it:
+
+```sh
+export PATH="$(go env GOPATH)/bin:$PATH"
+```
+
 The tool builds and watches applications, scaffolds plugins, models, migrations and admin controllers, and builds this documentation. Check that the framework compiles and its unit tests pass:
 
 ```sh