diff --git a/.b4-config b/.b4-config
new file mode 100644
index 0000000000..ba9520e0ba
--- /dev/null
+++ b/.b4-config
@@ -0,0 +1,4 @@
+[b4]
+    midmask = https://inbox.sourceware.org/%s
+    linkmask = https://inbox.sourceware.org/%s
+    send-series-to = libc-alpha@sourceware.org