--- gcc-8.4.0/gcc/doc/invoke.texi	2020-03-04 03:30:00.000000000 -0500
+++ gcc-8.4.0_new/gcc/doc/invoke.texi	2020-05-01 13:10:36.517390533 -0400
@@ -11404,7 +11404,8 @@
 @opindex fsanitize=undefined
 Enable UndefinedBehaviorSanitizer, a fast undefined behavior detector.
 Various computations are instrumented to detect undefined behavior
-at runtime.  Current suboptions are:
+at runtime.  If this option is enabled all sub-options listed below will be
+enabled unless otherwise specified. Current suboptions are:
 
 @table @gcctabopt