diff --git a/zig-impl/crystal/some-crystal-app/makefile b/zig-impl/crystal/some-crystal-app/makefile
index d938c38..455e27c 100644
--- a/zig-impl/crystal/some-crystal-app/makefile
+++ b/zig-impl/crystal/some-crystal-app/makefile
@@ -37,3 +37,10 @@ run-authc:
 
 run-test:
 	crystal run src/libauth.cr
+
+doc:
+	crystal docs
+
+ACCESS_LOGS ?= ./access.log
+serve-doc:
+	darkhttpd docs/ --addr 127.0.0.1 --port 35001 --log $(ACCESS_LOGS)