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-rw-r--r--lib/unicorn/http_server.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index 509fb36..329c5bf 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -389,6 +389,10 @@ class Unicorn::HttpServer
 
   # wait for a signal hander to wake us up and then consume the pipe
   def master_sleep(sec)
+    # 11 bytes is the maximum string length which can be embedded within
+    # the Ruby itself and not require a separate malloc (on 32-bit MRI 1.9+).
+    # Most reads are only one byte here and uncommon, so it's not worth a
+    # persistent buffer, either:
     IO.select([ SELF_PIPE[0] ], nil, nil, sec) or return
     SELF_PIPE[0].kgio_tryread(11)
   end