diff --git a/radicle-cli/examples/rad-issue.md b/radicle-cli/examples/rad-issue.md
index bd22da81..3be1435b 100644
--- a/radicle-cli/examples/rad-issue.md
+++ b/radicle-cli/examples/rad-issue.md
@@ -37,3 +37,12 @@ Note: this can always be undone with the `unassign` subcommand.
 ```
 $ rad unassign de81d97d7fe07a80bfb339200c6af862d4526b6a z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi
 ```
+
+Great, now we have communicated to the world about our car's defect.
+
+But wait! We've found an important detail about the car's power requirements.
+It will help whoever works on a fix.
+
+```
+$ rad comment de81d97d7fe07a80bfb339200c6af862d4526b6a --message 'The flux capacitor needs 1.21 Gigawatts'
+```
diff --git a/radicle-cli/src/commands.rs b/radicle-cli/src/commands.rs
index 51e34a37..70fd80fa 100644
--- a/radicle-cli/src/commands.rs
+++ b/radicle-cli/src/commands.rs
@@ -6,6 +6,8 @@ pub mod rad_auth;
 pub mod rad_checkout;
 #[path = "commands/clone.rs"]
 pub mod rad_clone;
+#[path = "commands/comment.rs"]
+pub mod rad_comment;
 #[path = "commands/delegate.rs"]
 pub mod rad_delegate;
 #[path = "commands/edit.rs"]
diff --git a/radicle-cli/src/commands/comment.rs b/radicle-cli/src/commands/comment.rs
new file mode 100644
index 00000000..ac2cd9d6
--- /dev/null
+++ b/radicle-cli/src/commands/comment.rs
@@ -0,0 +1,116 @@
+use std::ffi::OsString;
+use std::str::FromStr;
+
+use anyhow::anyhow;
+
+use radicle::cob;
+use radicle::cob::issue::Issues;
+use radicle::cob::store;
+use radicle::prelude::*;
+use radicle::storage;
+use radicle::storage::WriteStorage;
+
+use crate::terminal as term;
+use crate::terminal::args::{Args, Error, Help};
+use crate::terminal::patch::Comment;
+
+pub const HELP: Help = Help {
+    name: "comment",
+    description: env!("CARGO_PKG_DESCRIPTION"),
+    version: env!("CARGO_PKG_VERSION"),
+    usage: r#"
+Usage
+
+    rad comment <id> [-m <text>]
+
+Options
+
+    -m, --message               Comment message
+        --help                  Print help
+"#,
+};
+
+#[derive(Debug)]
+pub struct Options {
+    pub id: cob::ObjectId,
+    pub message: Comment,
+}
+
+#[inline]
+fn parse_cob_id(val: OsString) -> anyhow::Result<cob::ObjectId> {
+    let val = val
+        .to_str()
+        .ok_or_else(|| anyhow!("object id specified is not UTF-8"))?;
+    cob::ObjectId::from_str(val).map_err(|_| anyhow!("invalid object id '{}'", val))
+}
+
+impl Args for Options {
+    fn from_args(args: Vec<OsString>) -> anyhow::Result<(Self, Vec<OsString>)> {
+        use lexopt::prelude::*;
+
+        let mut parser = lexopt::Parser::from_args(args);
+        let mut id: Option<cob::ObjectId> = None;
+        let mut message = Comment::default();
+
+        while let Some(arg) = parser.next()? {
+            match arg {
+                // Options.
+                Long("message") | Short('m') => {
+                    if message != Comment::Blank {
+                        // We skip this code when `no-message` is specified.
+                        let txt: String = parser.value()?.to_string_lossy().into();
+                        message.append(&txt);
+                    }
+                }
+                Long("no-message") => message = Comment::Blank,
+
+                // Common.
+                Long("help") => return Err(Error::Help.into()),
+
+                Value(val) if id.is_none() => id = Some(parse_cob_id(val)?),
+                _ => return Err(anyhow::anyhow!(arg.unexpected())),
+            }
+        }
+
+        Ok((
+            Options {
+                id: id.ok_or_else(|| anyhow!("an issue id to comment on must be provided"))?,
+                message,
+            },
+            vec![],
+        ))
+    }
+}
+
+fn comment(
+    options: &Options,
+    repo: &storage::git::Repository,
+    signer: impl Signer,
+) -> anyhow::Result<()> {
+    let message = options.message.clone().get("Enter a comment...");
+    if message.is_empty() {
+        return Ok(());
+    }
+
+    let mut issues = Issues::open(*signer.public_key(), repo)?;
+    let mut issue = issues.get_mut(&options.id).map_err(|e| match e {
+        store::Error::NotFound(_, _) => anyhow::anyhow!("Could not find issue {}", options.id),
+        _ => e.into(),
+    })?;
+    let (comment_id, _) = issue.root().expect("root comment always exists");
+
+    issue.comment(message, *comment_id, &signer)?;
+    Ok(())
+}
+
+pub fn run(options: Options, ctx: impl term::Context) -> anyhow::Result<()> {
+    let (_, id) = radicle::rad::cwd()
+        .map_err(|_| anyhow!("this command must be run in the context of a project"))?;
+    let profile = ctx.profile()?;
+    let repo = profile.storage.repository(id)?;
+    let signer = term::signer(&profile)?;
+
+    comment(&options, &repo, signer)?;
+
+    Ok(())
+}
diff --git a/radicle-cli/src/main.rs b/radicle-cli/src/main.rs
index 51695e11..acc4fd91 100644
--- a/radicle-cli/src/main.rs
+++ b/radicle-cli/src/main.rs
@@ -134,6 +134,14 @@ fn run_other(exe: &str, args: &[OsString]) -> Result<(), Option<anyhow::Error>>
                 args.to_vec(),
             );
         }
+        "comment" => {
+            term::run_command_args::<rad_comment::Options, _>(
+                rad_comment::HELP,
+                "Comment",
+                rad_comment::run,
+                args.to_vec(),
+            );
+        }
         "delegate" => {
             term::run_command_args::<rad_delegate::Options, _>(
                 rad_delegate::HELP,