diff --git a/src/api/mod.rs b/src/api/mod.rs
index 41f6bd8..94d9e93 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -3,6 +3,7 @@ use reqwest::{Client, RequestBuilder};
 use std::time::Duration;
 
 pub mod search;
+pub mod pull_request;
 
 fn base_request(client: &Client, credentials: &Credentials, url: &str) -> RequestBuilder {
     client
@@ -11,3 +12,11 @@ fn base_request(client: &Client, credentials: &Credentials, url: &str) -> Reques
         .header("Authorization", format!("token {}", credentials.token))
         .header("User-Agent", "timothyandrew/gh-stack")
 }
+
+fn base_patch_request(client: &Client, credentials: &Credentials, url: &str) -> RequestBuilder {
+    client
+        .patch(url)
+        .timeout(Duration::from_secs(5))
+        .header("Authorization", format!("token {}", credentials.token))
+        .header("User-Agent", "timothyandrew/gh-stack")
+}
\ No newline at end of file
diff --git a/src/api/pull_request.rs b/src/api/pull_request.rs
new file mode 100644
index 0000000..1030417
--- /dev/null
+++ b/src/api/pull_request.rs
@@ -0,0 +1,20 @@
+use std::error::Error;
+use serde::{Serialize};
+use std::rc::Rc;
+
+use crate::{Credentials, api};
+use crate::api::search::PullRequest;
+
+
+#[derive(Serialize, Debug)]
+struct UpdateDescriptionRequest<'a> {
+  body: &'a str
+}
+
+pub async fn update_description(description: String, pr: Rc<PullRequest>, c: &Credentials) -> Result<(), Box<dyn Error>> {
+  let client = reqwest::Client::new();
+  let body = UpdateDescriptionRequest { body: &description };
+  let request = api::base_patch_request(&client, &c, pr.url()).json(&body);
+  request.send().await?;
+  Ok(())
+}
\ No newline at end of file
diff --git a/src/api/search.rs b/src/api/search.rs
index c38a99b..91cc027 100644
--- a/src/api/search.rs
+++ b/src/api/search.rs
@@ -24,6 +24,8 @@ pub struct PullRequest {
     head: PullRequestRef,
     base: PullRequestRef,
     title: String,
+    url: String,
+    body: String
 }
 
 impl PullRequest {
@@ -35,12 +37,20 @@ impl PullRequest {
         &self.base.label
     }
 
+    pub fn url(&self) -> &str {
+        &self.url
+    }
+
     pub fn number(&self) -> usize {
         self.number
     }
     pub fn title(&self) -> &str {
         &self.title
     }
+
+    pub fn body(&self) -> &str {
+        &self.body
+    }
 }
 
 #[derive(Deserialize, Debug)]
diff --git a/src/graph.rs b/src/graph.rs
index 31b0a09..6bac1d6 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -4,7 +4,7 @@ use std::rc::Rc;
 
 use crate::api::search::PullRequest;
 
-pub fn build(prs: Vec<Rc<PullRequest>>) -> Graph<Rc<PullRequest>, usize> {
+pub fn build(prs: &Vec<Rc<PullRequest>>) -> Graph<Rc<PullRequest>, usize> {
     let mut tree = Graph::<Rc<PullRequest>, usize>::new();
     let heads = prs.iter().map(|pr| pr.head());
     let handles: Vec<_> = prs.iter().map(|pr| tree.add_node(pr.clone())).collect();
@@ -18,4 +18,4 @@ pub fn build(prs: Vec<Rc<PullRequest>>) -> Graph<Rc<PullRequest>, usize> {
     }
 
     tree
-}
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index acb7cc6..24cf1cf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 pub mod api;
 pub mod graph;
 pub mod markdown;
+pub mod persist;
 
 pub struct Credentials {
     // Personal access token
diff --git a/src/main.rs b/src/main.rs
index 6b0123c..a5de6a5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,11 +4,21 @@ use std::error::Error;
 use std::process;
 use std::rc::Rc;
 
-use gh_stack::api;
-use gh_stack::graph;
-use gh_stack::markdown;
+use gh_stack::{api, persist, graph, markdown};
 use gh_stack::Credentials;
 
+use std::io::{self, Write};
+
+pub fn read_cli_input(message: &str) -> String {
+    print!("{}", message);
+    io::stdout().flush().unwrap();
+
+    let mut buf = String::new();
+    io::stdin().read_line(&mut buf).unwrap();
+
+    buf.trim().to_owned()
+}
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     let env: HashMap<String, String> = env::vars().collect();
@@ -28,10 +38,23 @@ async fn main() -> Result<(), Box<dyn Error>> {
 
     let prs = api::search::fetch_pull_requests_matching(&pattern, &credentials).await?;
     let prs = prs.into_iter().map(|pr| Rc::new(pr)).collect();
-    let tree = graph::build(prs);
-    let table = markdown::build_table(tree);
-    println!("{}", table);
+    let tree = graph::build(&prs);
+    let table = markdown::build_table(tree, pattern);
 
+    for pr in prs.iter() {
+        println!("{}: {}", pr.number(), pr.title());
+    }
+
+    let response = read_cli_input("Going to update these PRs ☝️ (y/n): ");
+    match &response[..] {
+        "y" => persist::persist(&prs, &table, &credentials).await?,
+        _ => std::process::exit(1)
+    }
+
+    persist::persist(&prs, &table, &credentials).await?;
+
+    println!("Done!");
+    
     Ok(())
     /*
     # TODO
diff --git a/src/markdown.rs b/src/markdown.rs
index bb23969..15858e9 100644
--- a/src/markdown.rs
+++ b/src/markdown.rs
@@ -12,9 +12,9 @@ fn process(row: String) -> String {
     regex.replace_all(&row, "").into_owned()
 }
 
-pub fn build_table(graph: Graph<Rc<PullRequest>, usize>) -> String {
+pub fn build_table(graph: Graph<Rc<PullRequest>, usize>, title: &str) -> String {
     let mut out = String::new();
-    out.push_str("## Stacked PR Chain");
+    out.push_str(&format!("### Stacked PR Chain: {}\n", title));
     out.push_str("| PR | Title |  Merges Into  |\n");
     out.push_str("|:--:|:------|:-------------:|\n");
 
diff --git a/src/persist.rs b/src/persist.rs
new file mode 100644
index 0000000..50a5432
--- /dev/null
+++ b/src/persist.rs
@@ -0,0 +1,41 @@
+use regex::Regex;
+use std::error::Error;
+use futures::future::join_all;
+use std::rc::Rc;
+
+use crate::api::search::PullRequest;
+use crate::Credentials;
+use crate::api::pull_request;
+
+const SHIELD_OPEN: &str = "<!---GHSTACKOPEN-->";
+const SHIELD_CLOSE: &str = "<!---GHSTACKCLOSE-->";
+
+fn safe_replace(body: &str, table: &str) -> String {
+  let new = format!("\n{}\n{}\n{}\n", SHIELD_OPEN, table, SHIELD_CLOSE);
+
+  if body.contains(SHIELD_OPEN) {
+    let matcher = format!("(?s){}.*{}", regex::escape(SHIELD_OPEN), regex::escape(SHIELD_CLOSE));
+    let re = Regex::new(&matcher).unwrap();
+    re.replace_all(body, &new[..]).into_owned()
+  } else {
+    let mut body: String = body.to_owned();
+    body.push_str(&new);
+    body
+  }
+}
+
+pub async fn persist(prs: &Vec<Rc<PullRequest>>, table: &str, c: &Credentials) -> Result<(), Box<dyn Error>> {
+  let futures = prs.iter().map(|pr| {
+    let description = safe_replace(pr.body(), table);
+    pull_request::update_description(description, pr.clone(), c)
+  });
+
+  let results = join_all(futures.collect::<Vec<_>>()).await;
+
+  for result in results {
+    result.unwrap();
+  }
+
+  Ok(())
+  
+}
\ No newline at end of file