diff --git a/Cargo.toml b/Cargo.toml
index aa25ae5..b36eb3a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "is-ip"
 version = "0.1.0"
 authors = ["hiql <dev.hiql@icloud.com>"]
-categories = ["Network programming"]
+categories = ["network-programming"]
 description = "Check if a string is an IP address"
 documentation = "https://docs.rs/is-ip"
 edition = "2021"
diff --git a/README.md b/README.md
index cc0e594..b9ecdfb 100644
--- a/README.md
+++ b/README.md
@@ -26,19 +26,19 @@ is_ipv4("1:2:3:4:5:6:7:8");
 
 ## API
 
-#### is_ip(string: &str) -> bool
+### is_ip(string: &str) -> bool
 
 Check if `string` is IPv6 or IPv4.
 
-#### is_ipv4(string: &str) -> bool
+### is_ipv4(string: &str) -> bool
 
 Check if `string` is IPv4.
 
-#### is_ipv6(string: &str) -> bool
+### is_ipv6(string: &str) -> bool
 
 Check if `string` is IPv6.
 
-#### ip_version(string: &str) -> Option<u8>
+### ip_version(string: &str) -> Option<u8>
 
 Returns `Some(6)` if `string` is IPv6, `Some(4)` if `string` is IPv4, or `None` if `string` is neither.