diff --git a/notmuch.c b/notmuch.c
index c47e640..446c810 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -157,23 +157,23 @@ command_t commands[] = {
 };
 
 static void
-usage (void)
+usage (FILE *out)
 {
     command_t *command;
     unsigned int i;
 
-    fprintf (stderr, "Usage: notmuch <command> [args...]\n");
-    fprintf (stderr, "\n");
-    fprintf (stderr, "Where <command> and [args...] are as follows:\n");
-    fprintf (stderr, "\n");
+    fprintf (out, "Usage: notmuch <command> [args...]\n");
+    fprintf (out, "\n");
+    fprintf (out, "Where <command> and [args...] are as follows:\n");
+    fprintf (out, "\n");
 
     for (i = 0; i < ARRAY_SIZE (commands); i++) {
 	command = &commands[i];
 
-	fprintf (stderr, "\t%s\t%s\n\n", command->name, command->summary);
+	fprintf (out, "\t%s\t%s\n\n", command->name, command->summary);
     }
 
-    fprintf (stderr, "Use \"notmuch help <command>\" for more details on each command.\n\n");
+    fprintf (out, "Use \"notmuch help <command>\" for more details on each command.\n\n");
 }
 
 static int
@@ -183,8 +183,8 @@ notmuch_help_command (unused (void *ctx), int argc, char *argv[])
     unsigned int i;
 
     if (argc == 0) {
-	fprintf (stderr, "The notmuch mail system.\n\n");
-	usage ();
+	fprintf (stdout, "The notmuch mail system.\n\n");
+	usage (stdout);
 	return 0;
     }
 
@@ -192,8 +192,8 @@ notmuch_help_command (unused (void *ctx), int argc, char *argv[])
 	command = &commands[i];
 
 	if (strcmp (argv[0], command->name) == 0) {
-	    fprintf (stderr, "Help for \"notmuch %s\":\n\n", argv[0]);
-	    fprintf (stderr, "\t%s\t%s\n\n%s\n\n", command->name,
+	    fprintf (stdout, "Help for \"notmuch %s\":\n\n", argv[0]);
+	    fprintf (stdout, "\t%s\t%s\n\n%s\n\n", command->name,
 		     command->summary, command->documentation);
 	    return 0;
 	}