diff --git a/docs/reference/symbols/README.md b/docs/reference/symbols/README.md
new file mode 100644
index 0000000..1b88159
--- /dev/null
+++ b/docs/reference/symbols/README.md
@@ -0,0 +1,10 @@
+# metro.symbols
+
+There are two symbols in metro.symbols:
+
+```
+metro.symbols.isProxy
+metro.symbols.source
+```
+
+You can use these to test if an object is a metro proxy, and to recover the source object of such a Proxy.
\ No newline at end of file