diff --git a/R/zzz.R b/R/zzz.R
new file mode 100644
index 0000000..c1314ae
--- /dev/null
+++ b/R/zzz.R
@@ -0,0 +1,4 @@
+.onAttach <- function(libname, pkgname)
+{
+  suppressPackageStartupMessages(requireNamespace("igraph", quietly = TRUE))
+}