diff --git a/Makefile.in b/Makefile.in
index 6b0e9aaf2..eb4ee4f3f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -118,11 +118,11 @@ BUILTIN_DOC_HDR := $(BUILTIN_DOC_SRC:.txt=.doxygen)
 #
 CMD_DOC_SRC := doc_src/contains.txt doc_src/count.txt doc_src/dirh.txt	\
 	doc_src/dirs.txt doc_src/fish_pager.txt doc_src/fishd.txt			\
-	doc_src/help.txt doc_src/mimedb.txt doc_src/nextd.txt				\
-	doc_src/open.txt doc_src/popd.txt doc_src/prevd.txt					\
-	doc_src/psub.txt doc_src/pushd.txt doc_src/set_color.txt			\
-	doc_src/trap.txt doc_src/type.txt doc_src/umask.txt					\
-	doc_src/vared.txt
+	doc_src/help.txt doc_src/isatty.txt doc_src/mimedb.txt				\
+	doc_src/nextd.txt doc_src/open.txt doc_src/popd.txt					\
+	doc_src/prevd.txt doc_src/psub.txt doc_src/pushd.txt				\
+	doc_src/set_color.txt doc_src/trap.txt doc_src/type.txt				\
+	doc_src/umask.txt doc_src/vared.txt
 
 #
 # Files generated by running doxygen on the files in $(CMD_DOC_SRC)