diff --git a/README.md b/README.md
index c10abce..482090b 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 # Endlessh: an SSH tarpit
 
-Endlessh is an SSH tarpit that *very* slowly sends an endless, random
-SSH banner. It keeps SSH clients locked up for hours or even days at a
-time. The purpose is to put your real SSH server on another port and
-then let the script kiddies get stuck in this tarpit instead of
+Endlessh is an SSH tarpit [that *very* slowly sends an endless, random
+SSH banner][np]. It keeps SSH clients locked up for hours or even days
+at a time. The purpose is to put your real SSH server on another port
+and then let the script kiddies get stuck in this tarpit instead of
 bothering a real server.
 
 Since the tarpit is in the banner before any cryptographic exchange
@@ -11,6 +11,8 @@ occurs, this program doesn't depend on any cryptographic libraries. It's
 a simple, single-threaded, standalone C program. It uses `poll()` to
 trap multiple clients at a time.
 
+
+
 ## Usage
 
 Usage information is printed with `-h`.
@@ -76,3 +78,6 @@ RHEL 6 and CentOS 6 use a version of glibc older than 2.17 (December
 will need to link against librt:
 
     make LDLIBS=-lrt
+
+
+[np]: https://nullprogram.com/blog/2019/03/22/