diff --git a/Cargo.lock b/Cargo.lock
index f9c7e12..20e0770 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -69,6 +69,8 @@ name = "github_action_doc"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "heck",
+ "indoc",
  "serde",
  "serde_yaml",
 ]
@@ -104,6 +106,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "indoc"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adab1eaa3408fb7f0c777a73e7465fd5656136fc93b670eb6df3c88c2c1344e3"
+
 [[package]]
 name = "itoa"
 version = "1.0.3"
diff --git a/Cargo.toml b/Cargo.toml
index 47972cb..92525b3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,5 +15,7 @@ path = "src/main.rs"
 
 [dependencies]
 clap = { version = "3.2.22", features = ["derive"] }
+heck = "0.4.0"
+indoc = "1.0.7"
 serde = { version = "1.0.145", features = ["derive"] }
 serde_yaml = "0.9.13"
diff --git a/src/cli.rs b/src/cli.rs
index 2ab2724..0a4bc94 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -16,6 +16,10 @@ pub enum Commands {
     Action {
         #[clap(required = true, value_parser)]
         action_file: String
+    },
+    Workflow {
+        #[clap(required = true, value_parser)]
+        workflow_file: String
     }
 }
 
diff --git a/src/main.rs b/src/main.rs
index be03418..5d1969c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,14 @@
+extern crate core;
+
 mod cli;
 mod action_doc;
+mod markdown;
+mod workflow_docs;
 
 use std::fs;
 use std::path::Path;
 use action_doc::GithubAction;
+use crate::workflow_docs::GitHubWorkflow;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let args = cli::parse_args();
@@ -15,6 +20,18 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             let readme_path = Path::new(&action_file).to_path_buf().parent().unwrap().join("README.md");
             fs::write(readme_path.to_str().unwrap(), gha.to_markdown()).expect("Unable to write readme");
         }
+        cli::Commands::Workflow { workflow_file} => {
+            let workflow = GitHubWorkflow::parse(&workflow_file)
+                .expect("Unable to parse workflow");
+            let wf_path = Path::new(&workflow_file).to_path_buf();
+            let readme_path = wf_path
+                .parent()
+                .unwrap()
+                .join(&format!("{}.md", wf_path.file_stem().unwrap().to_str().unwrap()));
+
+            println!("Writing workflow readme {:?}", &readme_path);
+            fs::write(readme_path.to_str().unwrap(), workflow.to_markdown()).expect("Unable to write readme");
+        }
     }
 
     Ok(())
diff --git a/src/markdown.rs b/src/markdown.rs
new file mode 100644
index 0000000..1ea93f4
--- /dev/null
+++ b/src/markdown.rs
@@ -0,0 +1,57 @@
+#![allow(dead_code)]
+use std::fmt::{Display, Formatter};
+
+pub struct Markdown {
+    doc: String
+}
+
+impl Markdown {
+    pub fn new() -> Markdown {
+        Markdown { doc: String::new() }
+    }
+
+    pub fn append_heading(&mut self, text: &str) {
+        self.doc.push_str(&format!("# {}\n\n", text));
+    }
+
+    pub fn append_new_lines(&mut self, n: u8) {
+        for _i in 0..n {
+            self.doc.push_str("\n")
+        }
+    }
+
+    pub fn append_text(&mut self, text: &str) {
+        self.doc.push_str(text);
+    }
+
+    pub fn append_line(&mut self, text: &str) {
+        self.doc.push_str(text);
+        self.append_new_lines(1);
+    }
+
+    pub fn append_list(&mut self, items: &Vec<String>) {
+        self.doc.push_str(&Self::make_list(items))
+    }
+
+    pub fn make_list(items: &Vec<String>) -> String {
+        let mut m = String::new();
+
+        for item in items {
+            m.push_str(&format!("* {}\n", item));
+        }
+
+        m.push_str("\n");
+
+        return m;
+    }
+}
+
+impl Display for Markdown {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+       f.write_str(&self.doc)
+    }
+}
+
+pub fn backtick(s: &String) -> String {
+    format!("`{}`", s)
+}
diff --git a/src/workflow_docs.rs b/src/workflow_docs.rs
new file mode 100644
index 0000000..a07c090
--- /dev/null
+++ b/src/workflow_docs.rs
@@ -0,0 +1,50 @@
+mod inputs;
+mod jobs;
+mod triggers;
+
+use std::collections::HashMap;
+use std::fs::File;
+use heck::ToSnakeCase;
+use serde::{Deserialize};
+use triggers::{GithubWorkflowTrigger, GithubWorkflowTriggerPayload };
+use jobs::WorkflowJob;
+use crate::markdown::Markdown;
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct GitHubWorkflow {
+    pub name: String,
+    pub on: HashMap<GithubWorkflowTrigger, GithubWorkflowTriggerPayload>,
+    pub jobs: HashMap<String, WorkflowJob>
+}
+
+impl GitHubWorkflow {
+    pub fn parse(path: &String) -> Result<GitHubWorkflow, Box<dyn std::error::Error>> {
+        let f = File::open(path).unwrap();
+        let action: GitHubWorkflow = serde_yaml::from_reader(f)?;
+        Ok(action)
+    }
+
+    pub fn to_markdown(self) -> String {
+        let mut doc = Markdown::new();
+
+        doc.append_heading(&self.name);
+
+        // triggers
+        doc.append_line("## Triggers\n");
+        let trigger_items = &self.on.keys().map(|t| t.to_string().to_snake_case()).collect();
+        doc.append_list(trigger_items);
+        doc.append_new_lines(1);
+
+        for (trigger, payload) in &self.on {
+            doc.append_text(&payload.to_markdown(trigger));
+        }
+
+        // jobs
+        doc.append_line("## Jobs\n");
+        for (_name, job) in &self.jobs {
+            doc.append_text(&job.to_markdown());
+        }
+
+        return doc.to_string();
+    }
+}
diff --git a/src/workflow_docs/inputs.rs b/src/workflow_docs/inputs.rs
new file mode 100644
index 0000000..fe0f5ec
--- /dev/null
+++ b/src/workflow_docs/inputs.rs
@@ -0,0 +1,18 @@
+use serde::{Deserialize};
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct GithubWorkflowInput {
+    pub description: String,
+    pub default: Option<String>,
+    #[serde(default)]
+    pub required: bool,
+    #[serde(alias = "type")]
+    pub input_type: String
+}
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct GithubWorkflowSecret {
+    pub description: String,
+    #[serde(default)]
+    pub required: bool
+}
diff --git a/src/workflow_docs/jobs.rs b/src/workflow_docs/jobs.rs
new file mode 100644
index 0000000..3510ae0
--- /dev/null
+++ b/src/workflow_docs/jobs.rs
@@ -0,0 +1,62 @@
+use serde::{Deserialize};
+use crate::markdown::Markdown;
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct WorkflowJob {
+   pub name: String,
+   pub uses: Option<String>,
+   #[serde(default)]
+   pub needs: Vec<String>,
+   #[serde(default)]
+   pub steps: Vec<WorkflowJobStep>
+}
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct WorkflowJobStep {
+   pub id: Option<String>,
+   pub name: Option<String>,
+   pub run: Option<String>,
+   pub uses: Option<String>
+}
+
+impl WorkflowJob {
+   pub fn to_markdown(&self) -> String {
+      let mut d = Markdown::new();
+
+      d.append_text(&format!("### {} ", &self.name));
+      d.append_new_lines(2);
+
+      match &self.uses {
+         Some(uses) => {
+           d.append_line(&format!("Uses the callable workflow: `{}`", uses));
+           d.append_new_lines(1);
+         }
+         _ => {}
+      }
+
+      if !self.steps.is_empty() {
+         d.append_line(&format!("**Steps:**"));
+         for step in &self.steps {
+            let uses = match &step.uses {
+               Some(uses) => { uses }
+               None => { "" }
+            };
+
+            let name = match &step.name {
+               Some(name) => { name }
+               None => {
+                  match &step.id {
+                     Some(id) => { id }
+                     None => { uses }
+                  }
+               }
+            };
+
+            d.append_line(&format!("* {} (`{}`)", name, match uses.is_empty() { true => "script", false => uses } ));
+         }
+         d.append_new_lines(1);
+      }
+
+      return d.to_string()
+   }
+}
diff --git a/src/workflow_docs/triggers.rs b/src/workflow_docs/triggers.rs
new file mode 100644
index 0000000..3fff6ed
--- /dev/null
+++ b/src/workflow_docs/triggers.rs
@@ -0,0 +1,127 @@
+use std::collections::HashMap;
+use std::fmt::{Formatter};
+use indoc::indoc;
+use serde::{Deserialize};
+use crate::markdown::{backtick, Markdown};
+use super::inputs::{GithubWorkflowInput, GithubWorkflowSecret};
+
+#[derive(Debug, Deserialize, PartialEq)]
+pub struct GithubWorkflowTriggerPayload {
+    #[serde(default)]
+    pub branches: Vec<String>,
+    #[serde(default)]
+    pub paths: Vec<String>,
+    #[serde(default)]
+    pub inputs: HashMap<String, GithubWorkflowInput>,
+    #[serde(default)]
+    pub secrets: HashMap<String, GithubWorkflowSecret>
+}
+
+#[derive(Debug, Deserialize, Eq, PartialEq, Hash)]
+pub enum GithubWorkflowTrigger {
+    #[serde(alias = "pull_request")]
+    PullRequest,
+    #[serde(alias = "push")]
+    Push,
+    #[serde(alias = "workflow_call")]
+    WorkflowCall,
+    #[serde(alias = "workflow_dispatch")]
+    WorkflowDispatch
+}
+
+impl std::fmt::Display for GithubWorkflowTrigger {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
+impl GithubWorkflowTriggerPayload {
+
+    fn doc_pull_request(&self) -> String {
+        let mut doc = Markdown::new();
+
+        doc.append_line("### Pull Request");
+        doc.append_new_lines(1);
+
+        if !self.branches.is_empty() {
+            doc.append_line("Branches:");
+            doc.append_list(&self.branches);
+        }
+
+        if !self.paths.is_empty() {
+            doc.append_line("Paths:");
+            let paths = &self.paths.iter().map(|t| backtick(t)).collect();
+            doc.append_list(paths);
+        }
+
+        return doc.to_string();
+    }
+
+    fn doc_workflow_call(&self) -> String {
+        let mut mdown = String::new();
+        mdown.push_str(indoc!("
+            ### Workflow Call
+
+            This workflow can be [called](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_call)
+            from other workflows.
+
+            #### Inputs
+
+        "));
+
+        if !self.inputs.is_empty() {
+            mdown.push_str(indoc!("
+                | Input              | Description | Type     | Required | Default |
+                |:-------------------|:------------|:---------|:---------|:--------|
+            "));
+            for (name, input) in &self.inputs {
+                let input_default = match &input.default {
+                    Some(x) => format!("`{}`", x),
+                    None => " ".to_string()
+                };
+                mdown.push_str(&format!(
+                    "| {:18} | {:18} | {:10} | {:10} | {:18} |\n",
+                    name,
+                    input.description,
+                    input.input_type,
+                    match input.required { true => "yes", false => "no" },
+                    input_default
+                ));
+            }
+        } else {
+            mdown.push_str("No inputs.")
+        }
+
+        mdown.push_str("\n\n#### Secrets\n");
+        if !self.secrets.is_empty() {
+            mdown.push_str(indoc!("
+                | Secret             | Description     | Required |
+                |:-------------------|:----------------|:---------|
+            "));
+            for (name, secret) in &self.secrets {
+                mdown.push_str(&format!(
+                    "| {:18} | {:18} | {:10} |\n",
+                    name,
+                    secret.description,
+                    match secret.required { true => "yes", false => "no" }
+                ));
+            }
+        } else {
+            mdown.push_str("No secrets.")
+        }
+
+        return mdown
+    }
+
+    pub fn to_markdown(&self, trigger: &GithubWorkflowTrigger) -> String {
+        return match trigger {
+            GithubWorkflowTrigger::PullRequest => {
+                self.doc_pull_request()
+            },
+            GithubWorkflowTrigger::WorkflowCall => {
+                self.doc_workflow_call()
+            }
+            _ => { format!("") }
+        }
+    }
+}