diff --git a/Doc/Manual/Extending.html b/Doc/Manual/Extending.html
index c554d9f05..072f28963 100644
--- a/Doc/Manual/Extending.html
+++ b/Doc/Manual/Extending.html
@@ -3609,6 +3609,8 @@ There are various command line options which can aid debugging a SWIG interface
 -debug-top <n>    - Display entire parse tree at stages 1-4, <n> is a csv list of stages
 -debug-typedef    - Display information about the types and typedefs in the interface
 -debug-typemap    - Display information for debugging typemaps
+-debug-tmsearch   - Display typemap search debugging information
+-debug-tmused     - Display typemaps used debugging information
 </pre></div>
 
 <p>