diff --git a/doc/ref/Makefile.am b/doc/ref/Makefile.am
index 5935dc7fc..42760453c 100644
--- a/doc/ref/Makefile.am
+++ b/doc/ref/Makefile.am
@@ -33,7 +33,7 @@ guile_TEXINFOS = preface.texi intro.texi program.texi scheme-intro.texi \
 	expect.texi scsh.texi tcltk.texi scripts.texi gh.texi scm.texi \
 	debugging.texi indices.texi script-getopt.texi data-rep.texi \
 	extend.texi repl-modules.texi srfi-modules.texi misc-modules.texi \
-	scheme-compound.texi autoconf.texi autoconf-macros.texi
+	scheme-compound.texi autoconf.texi autoconf-macros.texi tools.texi
 
 ETAGS_ARGS = $(info_TEXINFOS) $(guile_TEXINFOS)