diff --git a/changelog.d/4974.misc b/changelog.d/4974.misc
new file mode 100644
index 0000000000..672a18923a
--- /dev/null
+++ b/changelog.d/4974.misc
@@ -0,0 +1 @@
+Add `config.signing_key_path` that can be read by `synapse.config` utility.
diff --git a/synapse/config/key.py b/synapse/config/key.py
index 933928885a..eb10259818 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -42,7 +42,8 @@ class KeyConfig(Config):
         if "signing_key" in config:
             self.signing_key = read_signing_keys([config["signing_key"]])
         else:
-            self.signing_key = self.read_signing_key(config["signing_key_path"])
+            self.signing_key_path = config["signing_key_path"]
+            self.signing_key = self.read_signing_key(self.signing_key_path)
 
         self.old_signing_keys = self.read_old_signing_keys(
             config.get("old_signing_keys", {})