diff --git a/man7/signal.7 b/man7/signal.7
index 47289e9d6..01c0ded04 100644
--- a/man7/signal.7
+++ b/man7/signal.7
@@ -77,6 +77,12 @@ or catch the signal with a
 .IR "signal handler" ,
 a programmer-defined function that is automatically invoked
 when the signal is delivered.
+(By default, the signal handler is invoked on the
+normal process stack.
+It is possible to arrange that the signal handler
+uses an alternate stack; see
+.BR sigaltstack (2)
+for a discussion of how to do this and when it might be useful.)
 
 The signal disposition is a per-process attribute:
 in a multithreaded application, the disposition of a