diff --git a/Makefile b/Makefile
index 8a7466e..b1c85c2 100644
--- a/Makefile
+++ b/Makefile
@@ -39,8 +39,8 @@ clean:
 	$(MAKE) -C embed clean
 
 docs: README.md doc/ctpv.1
-	./deplist.awk $(PRE) | ./deplist.md.sh | ./deplistadd.sh README.md
-	./deplist.awk $(PRE) | ./deplist.1.sh | ./deplistadd.sh doc/ctpv.1
+	deptable/list.awk $(PRE) | deptable/markdown.sh | deptable/insert.sh README.md
+	deptable/list.awk $(PRE) | deptable/roff.sh     | deptable/insert.sh doc/ctpv.1
 
 ctpv: $(OBJ)
 	$(CC) -o $@ $+ $(LDFLAGS)
diff --git a/deplistadd.sh b/deptable/insert.sh
similarity index 68%
rename from deplistadd.sh
rename to deptable/insert.sh
index 4fe3f07..4615042 100755
--- a/deplistadd.sh
+++ b/deptable/insert.sh
@@ -1,11 +1,14 @@
 #!/bin/sh
 
+set -e
+
+tmp="$(mktemp XXXXXX)"
 table="$(mktemp XXXXXX)"
 trap 'rm "$table"' EXIT
 
 cat > "$table"
 
-sed -i "
+sed "
 	/TABLESTART/,/TABLEEND/ {
 		/TABLESTART/ {
 			r $table
@@ -13,4 +16,6 @@ sed -i "
 		}
 		/TABLEEND/!d
 	}
-" "$1"
+" "$1" > "$tmp"
+
+mv -- "$tmp" "$1"
diff --git a/deplist.awk b/deptable/list.awk
similarity index 100%
rename from deplist.awk
rename to deptable/list.awk
diff --git a/deplist.md.sh b/deptable/markdown.sh
similarity index 100%
rename from deplist.md.sh
rename to deptable/markdown.sh
diff --git a/deplist.1.sh b/deptable/roff.sh
similarity index 100%
rename from deplist.1.sh
rename to deptable/roff.sh