diff --git a/Cargo.lock b/Cargo.lock
index 9ba33dc..8026f48 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -247,9 +247,9 @@ dependencies = [
 
 [[package]]
 name = "futures-channel"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2d31b7ec7efab6eefc7c57233bb10b847986139d88cc2f5a02a1ae6871a1846"
+checksum = "8c2dd2df839b57db9ab69c2c9d8f3e8c81984781937fe2807dc6dcf3b2ad2939"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -257,9 +257,9 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79e5145dde8da7d1b3892dad07a9c98fc04bc39892b1ecc9692cf53e2b780a65"
+checksum = "15496a72fabf0e62bdc3df11a59a3787429221dd0710ba8ef163d6f7a9112c94"
 
 [[package]]
 name = "futures-executor"
@@ -274,15 +274,15 @@ dependencies = [
 
 [[package]]
 name = "futures-io"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28be053525281ad8259d47e4de5de657b25e7bac113458555bb4b70bc6870500"
+checksum = "d71c2c65c57704c32f5241c1223167c2c3294fd34ac020c807ddbe6db287ba59"
 
 [[package]]
 name = "futures-macro"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c287d25add322d9f9abdcdc5927ca398917996600182178774032e9f8258fedd"
+checksum = "ea405816a5139fb39af82c2beb921d52143f556038378d6db21183a5c37fbfb7"
 dependencies = [
  "proc-macro-hack",
  "proc-macro2",
@@ -292,24 +292,21 @@ dependencies = [
 
 [[package]]
 name = "futures-sink"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "caf5c69029bda2e743fddd0582d1083951d65cc9539aebf8812f36c3491342d6"
+checksum = "85754d98985841b7d4f5e8e6fbfa4a4ac847916893ec511a2917ccd8525b8bb3"
 
 [[package]]
 name = "futures-task"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13de07eb8ea81ae445aca7b69f5f7bf15d7bf4912d8ca37d6645c77ae8a58d86"
-dependencies = [
- "once_cell",
-]
+checksum = "fa189ef211c15ee602667a6fcfe1c1fd9e07d42250d2156382820fba33c9df80"
 
 [[package]]
 name = "futures-util"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "632a8cd0f2a4b3fdea1657f08bde063848c3bd00f9bbf6e256b8be78802e624b"
+checksum = "1812c7ab8aedf8d6f2701a43e1243acdbcc2b36ab26e2ad421eb99ac963d96d1"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -428,12 +425,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "once_cell"
-version = "1.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13bd41f508810a131401606d54ac32a467c97172d74ba7662562ebba5ad07fa0"
-
 [[package]]
 name = "oorandom"
 version = "11.1.3"
@@ -606,9 +597,9 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
-version = "1.0.123"
+version = "1.0.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92d5161132722baa40d802cc70b15262b98258453e85e5d1d365c757c73869ae"
+checksum = "bd761ff957cb2a45fbb9ab3da6512de9de55872866160b23c25f1a841e99d29f"
 
 [[package]]
 name = "serde_cbor"
@@ -622,9 +613,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.123"
+version = "1.0.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9391c295d64fc0abb2c556bad848f33cb8296276b1ad2677d1ae1ace4f258f31"
+checksum = "1800f7693e94e186f5e25a28291ae1570da908aff7d97a095dec1e56ff99069b"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index c82cf6d..795f606 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,9 +11,9 @@ keywords = ["robots", "txt", "parse", "compile"]
 repository = "https://github.com/crestonbunch/cylon"
 
 [dependencies]
-futures-util = "0.3"
-serde = "1.0"
-serde_derive = "1.0"
+futures-util = "0.3.13"
+serde = "1.0.124"
+serde_derive = "1.0.124"
 
 [dev-dependencies]
 criterion = { version = "0.3", features = ["async_futures"] }
diff --git a/src/dfa.rs b/src/dfa.rs
index 461670e..5e57ea5 100644
--- a/src/dfa.rs
+++ b/src/dfa.rs
@@ -4,6 +4,7 @@ use serde_derive::{Deserialize, Serialize};
 pub enum Rule<'a> {
     Allow(&'a str),
     Disallow(&'a str),
+    Delay(u64),
 }
 
 impl<'a> Rule<'a> {
@@ -11,6 +12,7 @@ impl<'a> Rule<'a> {
         match self {
             Rule::Allow(inner) => inner,
             Rule::Disallow(inner) => inner,
+            Rule::Delay(inner) => inner,
         }
     }
 }
diff --git a/src/parse.rs b/src/parse.rs
index e147409..921eaba 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -5,6 +5,7 @@ use futures_util::{
 };
 use serde_derive::{Deserialize, Serialize};
 const UA_PREFIX: &str = "user-agent:";
+const DELAY_PREFIX: &str = "crawl-delay:";
 const ALLOW_PREFIX: &str = "allow:";
 const DISALLOW_PREFIX: &str = "disallow:";
 
@@ -12,6 +13,7 @@ const DISALLOW_PREFIX: &str = "disallow:";
 enum ParsedRule {
     Allow(String),
     Disallow(String),
+    Delay(u64),
 }
 
 impl<'a> Into<Rule<'a>> for &'a ParsedRule {
@@ -19,6 +21,7 @@ impl<'a> Into<Rule<'a>> for &'a ParsedRule {
         match self {
             ParsedRule::Allow(path) => Rule::Allow(&path[..]),
             ParsedRule::Disallow(path) => Rule::Disallow(&path[..]),
+            ParsedRule::Delay(delay) => Rule.Delay(delay),
         }
     }
 }
@@ -171,6 +174,7 @@ fn parse_line(line: String) -> ParsedLine {
         .map(|s| ParsedLine::Rule(ParsedRule::Disallow(s.into())))
         .or_else(|| parse_user_agent(line).map(|s| ParsedLine::UserAgent(s.to_lowercase())))
         .or_else(|| parse_allow(line).map(|s| ParsedLine::Rule(ParsedRule::Allow(s.into()))))
+        .or_else(|| parse_delay(line).map(|s| ParsedLine::Rule(ParsedRule::Delay(s.into()))))
         .unwrap_or(ParsedLine::Nothing)
 }
 
@@ -195,6 +199,20 @@ fn parse_user_agent(line: &str) -> Option<&str> {
     }
 }
 
+fn parse_delay(line: &str) -> Option<u64> {
+    if line.len() < DELAY_PREFIX.len() {
+        return None;
+    }
+
+    let prefix = &line[..DELAY_PREFIX.len()].to_ascii_lowercase();
+    let suffix = &line[DELAY_PREFIX.len()..];
+    if prefix == DELAY_PREFIX {
+        Some(suffix.trim())
+    } else {
+        None
+    }
+}
+
 fn parse_allow(line: &str) -> Option<&str> {
     if line.len() < ALLOW_PREFIX.len() {
         return None;