diff --git a/cli/default.nix b/cli/default.nix
index 80913d8..5e8ee65 100644
--- a/cli/default.nix
+++ b/cli/default.nix
@@ -1,5 +1,7 @@
 { pkgs, eggDerivation, chickenPackages, xxd }:
-eggDerivation {
+let
+  manPages = pkgs.callPackage ../docs/manpages.nix {};
+in eggDerivation {
   name = "zilch-cli";
   src = ./.;
 
@@ -13,5 +15,7 @@ eggDerivation {
 
   preBuild = ''
     (cat ${./overrides.json}; printf '\0') | ${xxd}/bin/xxd -i -n stock_overrides > stock_overrides.h
+    (cat ${manPages.rust.txt}; printf '\0') | ${xxd}/bin/xxd -i -n man_rust > man_rust.h
+    (cat ${manPages.go.txt}; printf '\0') | ${xxd}/bin/xxd -i -n man_go > man_go.h
   '';
 }
diff --git a/cli/zilch-go.scm b/cli/zilch-go.scm
index c8ffb3d..09b5f42 100644
--- a/cli/zilch-go.scm
+++ b/cli/zilch-go.scm
@@ -4,29 +4,13 @@
   (foreign-lambda* int ()
     "cpu_set_t set; sched_getaffinity(0, sizeof(set), &set); C_return(CPU_COUNT(&set));"))
 
+(foreign-declare "#include \"man_go.h\"")
+(define man-page (foreign-value "man_go" nonnull-c-string))
+
 (define (print-help msg)
   (when msg
     (write-string (string-append msg "\n\n") (current-error-port)))
-  (write-string "Usage: zilch-cli-go [OPTION] [PACKAGE...]
-Process the given module (or the current directory, if unspecified) and
-output the store path for each package given on the command line (or
-all executables in the module, if unspecified)
-
-  -h, --help              Print this help message.
-  -j, --max-jobs COUNT    The maximum amount of builds to run. Defaults
-                          to the amount of cores.
-  -v, --verbose           Increase the verbosity configured in the Nix
-                          daemon.
-  -L, --print-build-logs  Print derivation logs as they come in.
-  -m, --module-dir DIR    The directory to use as root module.
-  -r, --replace DIR       Replace the module specified by the go.mod
-                          with this source directory, rather than using
-                          the upstream module. Can be specified more
-                          than once.
-
-   --debug                Crash on the first error, rather than
-                          continuing with the next package.
-" (current-error-port))
+  (write-string man-page (current-error-port))
   (exit (or (not msg) 1)))
 
 (define-values (options args)
diff --git a/cli/zilch-rust.scm b/cli/zilch-rust.scm
index 213f1cb..44d724f 100644
--- a/cli/zilch-rust.scm
+++ b/cli/zilch-rust.scm
@@ -3,6 +3,9 @@
 (foreign-declare "#include \"stock_overrides.h\"")
 (define stock-overrides (foreign-value "stock_overrides" nonnull-c-string))
 
+(foreign-declare "#include \"man_rust.h\"")
+(define man-page (foreign-value "man_rust" nonnull-c-string))
+
 (define get-cpu-count
   (foreign-lambda* int ()
     "cpu_set_t set; sched_getaffinity(0, sizeof(set), &set); C_return(CPU_COUNT(&set));"))
@@ -10,30 +13,7 @@
 (define (print-help msg)
   (when msg
     (write-string (string-append msg "\n\n") (current-error-port)))
-  (write-string "Usage: zilch-cli-rust [OPTION] [TARGET...]
-Process the given crate directory (or the current directory, if unspecified)
-and output derivations for each target given on the command line (or all
-executables in the crate, if unspecified)
-
-  -h, --help              Print this help message.
-  -j, --max-jobs COUNT    The maximum amount of builds to run. Defaults
-                          to the amount of cores.
-  -v, --verbose           Increase the verbosity configured in the Nix
-                          daemon.
-  -L, --print-build-logs  Print derivation logs as they come in.
-  -m, --crate-dir DIR     The directory to use as root crate.
-  -r, --replace DIR       Replace the crate specified by the Cargo.toml
-                          with this source directory, rather than using
-                          the upstream crate. Can be specified more
-                          than once.
-  -z, --overrides PATH    Read build script overrides from this file.
-                          By default, a stock set of overrides is read.
-                          This can be disabled by passing `-z \"\"`
-                          (a blank string).
-
-   --debug                Crash on the first error, rather than
-                          continuing with the next package.
-" (current-error-port))
+  (write-string man-page (current-error-port))
   (exit (or (not msg) 1)))
 
 (define-values (options args)
diff --git a/docs/manpages.nix b/docs/manpages.nix
new file mode 100644
index 0000000..b1967ed
--- /dev/null
+++ b/docs/manpages.nix
@@ -0,0 +1,13 @@
+{ pkgs, asciidoctor, groff, ... }: let
+  generateManpage = name: file: pkgs.runCommandNoCC name {} ''
+    ${asciidoctor}/bin/asciidoctor -b manpage -o $out ${file}
+  '';
+  textifyManpage = name: manpage: pkgs.runCommandNoCC name {} ''
+    ${groff}/bin/groff -t -e -mandoc -Tascii ${manpage} > $out
+  '';
+
+  generateBoth = name: file: rec { man = generateManpage name file; txt = textifyManpage "${name}.txt" man; };
+in {
+  rust = generateBoth "zilch-cli-rust.1" ./modules/ROOT/pages/rust/man.adoc;
+  go = generateBoth "zilch-cli-go.1" ./modules/ROOT/pages/go/man.adoc;
+}