diff --git a/README.md b/README.md
index 83beb55..e5b136f 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Plus it's a pretty good annoyed sigh onomatopoeia.
 
 ### Building
 
-You'll need `pkg-config`, `libzfslinux-dev`, `libtss2-dev`, and `make` should hopefully Just Work™ if you have a C++17-capable compiler.
+You'll need `pkg-config`, `ronn`, `libzfslinux-dev`, `libtss2-dev`, and `make` should hopefully Just Work™ if you have a C++17-capable compiler.
 The output binaries are trimmed of extraneous dependencies, so they're all just libc + libzfs and friends + TPM back-end.
 
 ### Installation
diff --git a/src/bin/zfs-tpm2-change-key.cpp b/src/bin/zfs-tpm2-change-key.cpp
index cbd0003..09a437c 100644
--- a/src/bin/zfs-tpm2-change-key.cpp
+++ b/src/bin/zfs-tpm2-change-key.cpp
@@ -44,7 +44,7 @@ slice_iter<uint8_t> end(TPM2B_DIGEST & dg) {
 int main(int argc, char ** argv) {
 	const char * backup{};
 	return do_main(
-	    argc, argv, "b:", [&](auto) { backup = optarg; },
+	    argc, argv, "b:", "[-b backup-file]", [&](auto) { backup = optarg; },
 	    [&](auto dataset) {
 		    REQUIRE_KEY_LOADED(dataset);
 
diff --git a/src/bin/zfs-tpm2-clear-key.cpp b/src/bin/zfs-tpm2-clear-key.cpp
index a85a9d3..3eea699 100644
--- a/src/bin/zfs-tpm2-clear-key.cpp
+++ b/src/bin/zfs-tpm2-clear-key.cpp
@@ -15,7 +15,7 @@
 
 int main(int argc, char ** argv) {
 	return do_main(
-	    argc, argv, "", [&](auto) {},
+	    argc, argv, "", "", [&](auto) {},
 	    [&](auto dataset) {
 		    REQUIRE_KEY_LOADED(dataset);
 
diff --git a/src/bin/zfs-tpm2-load-key.cpp b/src/bin/zfs-tpm2-load-key.cpp
index 415fb80..cb45098 100644
--- a/src/bin/zfs-tpm2-load-key.cpp
+++ b/src/bin/zfs-tpm2-load-key.cpp
@@ -19,7 +19,7 @@
 int main(int argc, char ** argv) {
 	auto noop = B_FALSE;
 	return do_main(
-	    argc, argv, "n", [&](auto) { noop = B_TRUE; },
+	    argc, argv, "n", "[-n]", [&](auto) { noop = B_TRUE; },
 	    [&](auto dataset) {
 		    TPMI_DH_PERSISTENT handle{};
 		    TRY_MAIN(parse_key_props(dataset, THIS_BACKEND, handle));
diff --git a/src/main.hpp b/src/main.hpp
index f9adddb..79100e9 100644
--- a/src/main.hpp
+++ b/src/main.hpp
@@ -19,7 +19,7 @@
 
 
 template <class G, class M>
-int do_main(int argc, char ** argv, const char * getoptions, G && getoptfn, M && main) {
+int do_main(int argc, char ** argv, const char * getoptions, const char * usage, G && getoptfn, M && main) {
 	const auto libz = TRY_PTR("initialise libzfs", libzfs_init());
 	quickscope_wrapper libz_deleter{[=] { libzfs_fini(libz); }};
 
@@ -28,14 +28,26 @@ int do_main(int argc, char ** argv, const char * getoptions, G && getoptfn, M &&
 #if __GLIBC__
 	setenv("POSIXLY_CORRECT", "1", true);
 #endif
-	for(int opt; (opt = getopt(argc, argv, getoptions)) != -1;)
-		if(opt == '?')
-			return __LINE__;
-		else
-			getoptfn(opt);
+	auto gopts = reinterpret_cast<char *>(TRY_PTR("allocate options string", alloca(strlen(getoptions) + 2 + 1)));
+	snprintf(gopts, strlen(getoptions) + 2 + 1, "%shV", getoptions);
+	for(int opt; (opt = getopt(argc, argv, gopts)) != -1;)
+		switch(opt) {
+			case '?':
+			case 'h':
+				fprintf(opt == 'h' ? stdout : stderr, "Usage: %s [-hV] %s%s<dataset>\n", argv[0], usage, strlen(usage) ? " " : "");
+				return opt == 'h' ? 0 : __LINE__;
+			case 'V':
+				printf("tzpfms version %s\n", TZPFMS_VERSION);
+				return 0;
+			default:
+				getoptfn(opt);
+		}
 
 	if(optind >= argc) {
-		fprintf(stderr, "No dataset to act on?\n");
+		fprintf(stderr,
+		        "No dataset to act on?\n"
+		        "Usage: %s [-hV] %s%s<dataset>\n",
+		        argv[0], usage, strlen(usage) ? " " : "");
 		return __LINE__;
 	}
 	auto dataset = TRY_PTR(nullptr, zfs_open(libz, argv[optind], ZFS_TYPE_FILESYSTEM));