diff --git a/Sdext.tex b/Sdext.tex
index 7fea659e..9f152051 100644
--- a/Sdext.tex
+++ b/Sdext.tex
@@ -1,4 +1,4 @@
-\chapter{Sdext ISA Extension}
+\chapter{Sdext (ISA Extension)}
 \label{sec:core_debug}
 
 This chapter describes the Sdext ISA extension. It must be implemented to make
diff --git a/Sdtrig.tex b/Sdtrig.tex
index aeb2406d..a2242479 100644
--- a/Sdtrig.tex
+++ b/Sdtrig.tex
@@ -1,4 +1,4 @@
-\chapter{Sdtrig ISA Extension}
+\chapter{Sdtrig (ISA Extension)}
 \label{sec:trigger}
 
 This chapter describes the Sdtrig ISA extension, which can be implemented
diff --git a/debug_module.tex b/debug_module.tex
index 7f2ccc30..b13f68ce 100644
--- a/debug_module.tex
+++ b/debug_module.tex
@@ -1,4 +1,4 @@
-\chapter{Debug Module (DM), non-ISA} \label{chap:dm}
+\chapter{Debug Module (DM) (non-ISA extension)} \label{chap:dm}
 
 \begin{steps}{The Debug Module implements a translation interface between abstract debug
     operations and their specific implementation. It might support the following
diff --git a/dtm.tex b/dtm.tex
index 00fc4154..1157aced 100644
--- a/dtm.tex
+++ b/dtm.tex
@@ -1,4 +1,4 @@
-\chapter{Debug Transport Module (DTM), non-ISA} \label{dtm}
+\chapter{Debug Transport Module (DTM) (non-ISA extension)} \label{dtm}
 
 Debug Transport Modules provide access to the DM over one or more transports
 (e.g.\ JTAG or USB).