diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 68d1f364ac05ad3d1a5d7ee25d375be8a89897b8..8cf99f395a544199ac0cf8ca60c742ce11ba6ecb 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -34708,8 +34708,8 @@ see @ref{Other Builtins} for details.
 
 @opindex mmovbe
 @item -mmovbe
-This option enables use of the @code{movbe} instruction to implement
-@code{__builtin_bswap32} and @code{__builtin_bswap64}.
+This option enables use of the @code{movbe} instruction to optimize
+byte swapping of four and eight byte entities.
 
 @opindex mshstk
 @item -mshstk