diff --git a/rage/build.rs b/rage/build.rs
index a74b32fe..494d9e3f 100644
--- a/rage/build.rs
+++ b/rage/build.rs
@@ -389,7 +389,18 @@ impl Cli {
             out_dir,
             "rage-mount",
             "rage-keygen(1), rage(1)",
-            self.rage_mount.about(fl!("man-mount-about")),
+            self.rage_mount
+                .about(fl!("man-mount-about"))
+                .long_about(fl!("man-mount-description"))
+                .mut_arg("types", |a| {
+                    a.long_help(fl!(
+                        "man-mount-flag-types",
+                        types = crate::rage_mount::TYPES,
+                    ))
+                })
+                .mut_arg("identity", |a| {
+                    a.long_help(fl!("man-rage-flag-identity-decrypt"))
+                }),
             |_, w| {
                 Examples([
                     Example::new(fl!("man-mount-example-identity"))
diff --git a/rage/i18n/en-US/rage.ftl b/rage/i18n/en-US/rage.ftl
index 008bd6a4..308cf347 100644
--- a/rage/i18n/en-US/rage.ftl
+++ b/rage/i18n/en-US/rage.ftl
@@ -19,6 +19,8 @@
 -identity-prefix = AGE-SECRET-KEY-1
 -armor-pem-type = AGE ENCRYPTED FILE
 
+-rage-mount = rage-mount
+
 -ssh-rsa = ssh-rsa
 -ssh-ed25519 = ssh-ed25519
 -ssh-authorized-keys = authorized_keys
@@ -480,7 +482,28 @@ man-keygen-example-convert = Convert an identity to a recipient
 
 ## rage-mount manpage
 
-man-mount-about = Mount an age-encrypted filesystem
+man-mount-about = Mount an {-age} encrypted filesystem
+
+man-mount-description =
+    {-rage-mount} decrypts the {-age} encrypted filesystem at {mnt-filename} on the
+    fly, and mounts it as a directory on the local filesystem at {mnt-mountpoint}.
+
+    Passphrase-encrypted files are detected automatically and the passphrase is
+    requested interactively. Otherwise, one or more {identities} specified with
+    {-flag-identity} are used to decrypt the file.
+
+    The previous contents (if any) and owner and mode of {mnt-mountpoint} become
+    invisible, and as long as this filesystem remains mounted, the pathname
+    {mnt-mountpoint} refers to the root of the filesystem on {mnt-filename}.
+
+man-mount-flag-types =
+    Set the filesystem type. The following types are currently supported: {$types}.
+
+    This option is required. {-rage-mount} does not attempt to guess the filesystem
+    format.
+
+    In theory, any efficiently-seekable filesystem format can be supported. At
+    present, {-rage-mount} only supports seekable archive formats.
 
 man-mount-example-identity = Mounting an archive encrypted to a recipient
 man-mount-example-passphrase = Mounting an archive encrypted with a passphrase
diff --git a/rage/i18n/es-AR/rage.ftl b/rage/i18n/es-AR/rage.ftl
index 1b73a2eb..bdd27f72 100644
--- a/rage/i18n/es-AR/rage.ftl
+++ b/rage/i18n/es-AR/rage.ftl
@@ -19,6 +19,8 @@
 -identity-prefix = AGE-SECRET-KEY-1
 -armor-pem-type = AGE ENCRYPTED FILE
 
+-rage-mount = rage-mount
+
 -ssh-rsa = ssh-rsa
 -ssh-ed25519 = ssh-ed25519
 -ssh-authorized-keys = authorized_keys
diff --git a/rage/i18n/it/rage.ftl b/rage/i18n/it/rage.ftl
index b216bc16..8f43adbd 100644
--- a/rage/i18n/it/rage.ftl
+++ b/rage/i18n/it/rage.ftl
@@ -19,6 +19,8 @@
 -identity-prefix = AGE-SECRET-KEY-1
 -armor-pem-type = AGE ENCRYPTED FILE
 
+-rage-mount = rage-mount
+
 -ssh-rsa = ssh-rsa
 -ssh-ed25519 = ssh-ed25519
 -ssh-authorized-keys = authorized_keys
diff --git a/rage/i18n/zh-CN/rage.ftl b/rage/i18n/zh-CN/rage.ftl
index 0b5a6cb2..c65550d9 100644
--- a/rage/i18n/zh-CN/rage.ftl
+++ b/rage/i18n/zh-CN/rage.ftl
@@ -19,6 +19,8 @@
 -identity-prefix = AGE-SECRET-KEY-1
 -armor-pem-type = AGE ENCRYPTED FILE
 
+-rage-mount = rage-mount
+
 -ssh-rsa = ssh-rsa
 -ssh-ed25519 = ssh-ed25519
 -ssh-authorized-keys = authorized_keys
diff --git a/rage/i18n/zh-TW/rage.ftl b/rage/i18n/zh-TW/rage.ftl
index 46be7619..7ca24f40 100644
--- a/rage/i18n/zh-TW/rage.ftl
+++ b/rage/i18n/zh-TW/rage.ftl
@@ -19,6 +19,8 @@
 -identity-prefix = AGE-SECRET-KEY-1
 -armor-pem-type = AGE ENCRYPTED FILE
 
+-rage-mount = rage-mount
+
 -ssh-rsa = ssh-rsa
 -ssh-ed25519 = ssh-ed25519
 -ssh-authorized-keys = authorized_keys
diff --git a/rage/src/bin/rage-mount/cli.rs b/rage/src/bin/rage-mount/cli.rs
index 5da4e86d..0cb65dba 100644
--- a/rage/src/bin/rage-mount/cli.rs
+++ b/rage/src/bin/rage-mount/cli.rs
@@ -2,6 +2,8 @@ use clap::{builder::Styles, ArgAction, Parser};
 
 use crate::fl;
 
+pub(crate) const TYPES: &str = "\"tar\", \"zip\"";
+
 #[derive(Debug, Parser)]
 #[command(display_name = "rage-mount")]
 #[command(name = "rage-mount")]
@@ -39,7 +41,7 @@ pub(crate) struct AgeMountOptions {
 
     #[arg(short, long)]
     #[arg(value_name = fl!("mnt-types"))]
-    #[arg(help = fl!("help-arg-mnt-types", types = "\"tar\", \"zip\""))]
+    #[arg(help = fl!("help-arg-mnt-types", types = TYPES))]
     pub(crate) types: String,
 
     #[arg(long, value_name = "WF")]