diff --git a/.irbrc b/.irbrc
new file mode 100644
index 000000000..9835a73f3
--- /dev/null
+++ b/.irbrc
@@ -0,0 +1,5 @@
+# https://ruby-doc.org/stdlib-3.1.2/libdoc/irb/rdoc/IRB.html#module-IRB-label-Configuration
+#
+# ~/.irbrc will take precedence over this file.
+
+IRB.conf[:USE_AUTOCOMPLETE] = true