diff --git a/README.md b/README.md
index 7b6a5b3..8fd1c74 100644
--- a/README.md
+++ b/README.md
@@ -77,9 +77,10 @@ the server hostname or IP; this is typically required (by java RMI) for correct
 
 the server will use 3 consecutive TCP ports starting from this port
 
-#### services.ghidra-server.directory (`/var/lib/ghidra-server`)
+#### services.ghidra-server.directory (`ghidra-server`)
 
-the root directory for server files
+the root directory for server files, as a subdirectory of `/var/lib`. this is needed because this
+option is passed to systemd `StateDirectory=`
 
 #### services.ghidra-server.{user,group} (`ghidra`)
 
@@ -95,6 +96,10 @@ the service user and group
 a variant of ghidra built with a headless openjdk, intended to reduce closure size for server
 operation
 
+### `ocamlPackages.xlog`
+
+logging for cats, in ocaml: <https://git.lain.faith/haskal/xlog>
+
 ## lib documentation
 
 ### `fetchFromSteam`
diff --git a/modules/ghidra-server/default.nix b/modules/ghidra-server/default.nix
index d97b075..b161762 100644
--- a/modules/ghidra-server/default.nix
+++ b/modules/ghidra-server/default.nix
@@ -24,8 +24,10 @@ in {
       type = types.port;
     };
     directory = mkOption {
-      default = "/var/lib/ghidra-server";
-      description = "Directory for Ghidra server data.";
+      default = "ghidra-server";
+      description = ''
+        Directory for Ghidra server data, under `/var/lib` (for systemd `StateDirectory`)
+      '';
       type = types.str;
     };
     user = mkOption {