diff --git a/man/foreman.1.ronn b/man/foreman.1.ronn
index 838a392..7a79759 100644
--- a/man/foreman.1.ronn
+++ b/man/foreman.1.ronn
@@ -29,6 +29,10 @@ The following options control how the application is run:
     Specify the number of each process type to run. The value passed in
     should be in the format `process=num,process=num`
 
+  * `-p`, `--port`:
+    Specify which port to use as the base for this application. Should be
+    a multiple of 1000.
+
 ## EXPORTING
 
 `foreman export` is used to export your application to another process