1 files changed, 6 insertions, 1 deletions

diff --git a/SIGNALS b/SIGNALS
index 5c7295e..be96892 100644
--- a/SIGNALS
+++ b/SIGNALS
@@ -9,7 +9,12 @@ Unicorn and nginx.
 
 === Master Process
 
-* HUP - reload config file, app, and gracefully restart all workers
+* HUP - reloads config file and gracefully restart all workers.
+  If the "preload_app" directive is false (the default), then workers
+  will also pick up any application code changes when restarted.  If
+  "preload_app" is true, then application code changes will have no
+  effect; USR2 + QUIT (see below) must be used to load newer code in
+  this case.
 
 * INT/TERM - quick shutdown, kills all workers immediately