Update to installation instructions in documentation

README.md

@@ -1,7 +1,8 @@
 ### waitfor
 
 Small golang utility I've produced to block until a host is pingable.
-Designed to be used in expressions such as ```waitfor 192.168.1.2 60 && /bin/dosomething```
+
+Designed to be used in expressions such as `waitfor 192.168.1.2 60 && /bin/dosomething`
 
 
 #### Usage
@@ -10,3 +11,18 @@ Usage: waitfor <ip_addr> <timeout_secs>
 
 It sends one ping in a loop until either a response is received, or <timeout> seconds have elapsed with no response.
 It ends with an exit code 0 if a response was received, otherwise exit code 1.
+
+#### Installation
+
+##### MacOS and Linux
+
+After deploying the binary to a suitable directory like `/usr/local/bin`, ensure the permissions are correct.
+
+*Example* : `sudo chmod u=rwx,go=rx /usr/local/bin/waitfor`
+
+##### Then for Linux only...
+
+
+Also as root, use `setcap` to allow the binary to use raw sockets so that it can send and receive ICMP packets.
+
+*Example* : `sudo setcap cap_net_raw=+ep /usr/local/bin/waitfor`