diff --git a/library/prolog_pack.pl b/library/prolog_pack.pl
index 120a8c4a70..1d577ef149 100644
--- a/library/prolog_pack.pl
+++ b/library/prolog_pack.pl
@@ -1131,7 +1131,7 @@
 
 %!  pack_rebuild(+Pack) is det.
 %
-%   Rebuilt possible foreign components of Pack.
+%   Rebuild possible foreign components of Pack.
 
 pack_rebuild(Pack) :-
     current_pack(Pack, PackDir),
diff --git a/man/builtin.doc b/man/builtin.doc
index 4570672b61..a766ae129e 100644
--- a/man/builtin.doc
+++ b/man/builtin.doc
@@ -10907,7 +10907,7 @@ is \const{none}.  Supported \arg{Options} are:
 
 \begin{description}
     \termitem{extensions}{ListOfExtensions}
-List of file extensions to try.  Default is exam{['']}.  For each
+List of file extensions to try.  Default is \exam{['']}.  For each
 extension, absolute_file_name/3 will first add the extension and then
 verify the conditions imposed by the other options.  If the condition
 fails, the next extension on the list is tried.  Extensions may be