--- wikisrc/pkgsrc/hardening.mdwn	2017/11/07 02:22:50	1.31
+++ wikisrc/pkgsrc/hardening.mdwn	2017/11/07 02:26:54	1.32
@@ -89,8 +89,11 @@ TODO: Give a link to a comprehensive exp
 
 ### PKGSRC_USE_STACK_CHECK
 
-This uses `-fstack-check` with GCC for another stack protection
-mitigation.
+This uses `-fstack-check` with GCC for another stack protection mitigation.
+
+It asks the compiler to generate code verifying that it does not corrupt the
+stack. According to GCC's manual page, this is really only useful for
+multi-threaded programs.
 
 # Caveats