diff --git a/contrib/win32/mercurial.iss b/contrib/win32/mercurial.iss
--- a/contrib/win32/mercurial.iss
+++ b/contrib/win32/mercurial.iss
@@ -83,6 +83,7 @@ Source: dist\add_path.exe; DestDir: {app
 Source: doc\*.html; DestDir: {app}\Docs
 Source: doc\style.css; DestDir: {app}\Docs
 Source: mercurial\help\*.txt; DestDir: {app}\help
+Source: mercurial\help\internals\*.txt; DestDir: {app}\help\internals
 Source: mercurial\default.d\*.rc; DestDir: {app}\default.d
 Source: mercurial\locale\*.*; DestDir: {app}\locale; Flags: recursesubdirs createallsubdirs skipifsourcedoesntexist
 Source: mercurial\templates\*.*; DestDir: {app}\Templates; Flags: recursesubdirs createallsubdirs