diff --git a/bash/port_checking.bash b/bash/port_checking.bash
index 3b0b0d7..b7f98dc 100644
--- a/bash/port_checking.bash
+++ b/bash/port_checking.bash
@@ -1,5 +1,7 @@
 ## Stop installing tools just to check if a port is open. Bash has it built in.
 
+# Source: https://www.reddit.com/r/bash/comments/1rcgyb7/stop_installing_tools_just_to_check_if_a_port_is/
+
 # Instead of:
 telnet host 443
 # or