diff --git a/docs/Configuration.md b/docs/Configuration.md
index 69261b6cc7b4..681d3122c9c8 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -301,7 +301,7 @@ Example:
 {
   "moduleNameMapper": {
     "^image![a-zA-Z0-9$_-]+$": "GlobalImageStub",
-    "^[./a-zA-Z0-9$_-]+.png$": "<rootDir>/RelativeImageStub.js",
+    "^[./a-zA-Z0-9$_-]+\\.png$": "<rootDir>/RelativeImageStub.js",
     "module_name_(.*)": "<rootDir>/substituted_module_$1.js",
   },
 }