diff --git a/README.adoc b/README.adoc
index b9b5b81..cfc274a 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1,3 +1,8 @@
 = Read me
 
 This command outputs the ipv4 address for the interface given by name in argument.
+
+It uses `getifaddrs` form the `libc`.
+
+The man page : `man getifaddrs`
+