Update the option reference in README.md

1 files changed, 49 insertions, 38 deletions

diff --git a/README.md b/README.md
index ed242a5..7960328 100644
--- a/README.md
+++ b/README.md
@@ -7,44 +7,55 @@ An IPv4 and IPv6 validation utility for use in scripts
 
 Depends on libcidr by Matthew Fuller (http://www.over-yonder.net/~fullermd/projects/libcidr) and libpcre.
 
-    Usage: ./ipaddrcheck <OPTIONS> [STRING]
-    Options:
-        --is-valid                 Check if STRING is a valid IPv4 or IPv6 address
-                                   with or without prefix length
-        --is-any-cidr              Check if STRING is a valid IPv4 or IPv6 address
-                                   with prefix length
-        --is-any-single            Check if STRING is a valid single IPv4 or IPv6 address
-        --is-any-host              Check if STRING is a valid IPv4 or IPv6 host address
-        --is-any-net               Check if STRING is a valid IPv4 or IPv6 network address
-        --is-ipv4                  Check if STRING is a valid IPv4 address with mask 
-        --is-ipv4-cidr             Check if STRING is a valid CIDR-formatted address 
-        --is-ipv4-single           Check if STRING is a valid single address
-                                   (i.e. with no mask)
-        --is-ipv4-host             Check if STRING is a host address 
-        --is-ipv4-net              Check if STRING is a network address 
-        --is-ipv4-broadcast        Check if STRING is a broadcast address 
-        --is-ipv4-multicast        Check if STRING is a multicast address 
-        --is-ipv4-loopback         Check if STRING is a loopback address 
-        --is-ipv4-link-local       Check if STRING is a link-local address 
-        --is-ipv4-rfc1918          Check if STRING is a private (RFC1918) address 
-        --is-ipv6                  Check if STRING is a valid IPv6 address 
-        --is-ipv6-cidr             Check if STRING is a CIDR-formatted IPv6 address 
-        --is-ipv6-single           Check if STRING is an IPv6 address with no mask 
-        --is-ipv6-host             Check if STRING is an IPv6 host address 
-        --is-ipv6-net              Check if STRING is an IPv6 network address 
-        --is-ipv6-multicast        Check if STRING is an IPv6 multicast address 
-        --is-ipv6-link-local       Check if STRING is an IPv6 link-local address 
-        --is-valid-intf-address    Check if STRING is an IPv4 or IPv6 address that 
-                                   can be assigned to a network interface 
-        --allow-loopback           When used with --is-valid-intf-address,
-                                   makes IPv4 loopback addresses pass the check
-        --version                  Print version information and exit 
-        --help                     Print help message and exit
-
-    Exit codes:
-        0    if check passed,
-        1    if check failed,
-        2    if a problem occured (wrong option, internal error etc.)
+```
+Usage: ./src/ipaddrcheck <OPTIONS> [STRING]
+Address checking options:
+  --is-valid                 Check if STRING is a valid IPv4 or IPv6 address
+                               with or without prefix length
+  --is-any-cidr              Check if STRING is a valid IPv4 or IPv6 address
+                               with prefix length
+  --is-any-single            Check if STRING is a valid single IPv4 or IPv6 address
+  --is-any-host              Check if STRING is a valid IPv4 or IPv6 host address
+  --is-any-net               Check if STRING is a valid IPv4 or IPv6 network address
+  --is-ipv4                  Check if STRING is a valid IPv4 address with mask 
+  --is-ipv4-cidr             Check if STRING is a valid CIDR-formatted address 
+  --is-ipv4-single           Check if STRING is a valid single address
+                               (i.e. with no mask)
+  --is-ipv4-host             Check if STRING is a host address 
+  --is-ipv4-net              Check if STRING is a network address 
+  --is-ipv4-broadcast        Check if STRING is a broadcast address 
+  --is-ipv4-multicast        Check if STRING is a multicast address 
+  --is-ipv4-loopback         Check if STRING is a loopback address 
+  --is-ipv4-link-local       Check if STRING is a link-local address 
+  --is-ipv4-rfc1918          Check if STRING is a private (RFC1918) address 
+  --is-ipv6                  Check if STRING is a valid IPv6 address 
+  --is-ipv6-cidr             Check if STRING is a CIDR-formatted IPv6 address 
+  --is-ipv6-single           Check if STRING is an IPv6 address with no mask 
+  --is-ipv6-host             Check if STRING is an IPv6 host address 
+  --is-ipv6-net              Check if STRING is an IPv6 network address 
+  --is-ipv6-multicast        Check if STRING is an IPv6 multicast address 
+  --is-ipv6-link-local       Check if STRING is an IPv6 link-local address 
+  --is-valid-intf-address    Check if STRING is an IPv4 or IPv6 address that 
+                               can be assigned to a network interface 
+  --is-ipv4-range            Check if STRING is a valid IPv4 address range
+  --is-ipv6-range            Check if STRING is a valid IPv6 address range
+  
+Behavior options:
+  --allow-loopback             When used with --is-valid-intf-address,
+                                 makes IPv4 loopback addresses pass the check
+  --range-prefix-length <INT>  When used with --is-ipv4-range or --is-ipv6-range,
+                                 requires the range boundaries to lie within
+                                 a prefix of given length
+
+Other options:
+  --version                  Print version information and exit 
+  --help                     Print help message and exit
+
+Exit codes:
+  0    if check passed,
+  1    if check failed,
+  2    if a problem occured (wrong option, internal error etc.)
+```
 
 ## Building