diff --git a/.size-snapshot.json b/.size-snapshot.json
index c9b0bf5e6..c7ccafb94 100644
--- a/.size-snapshot.json
+++ b/.size-snapshot.json
@@ -1,26 +1,26 @@
 {
   "esm/history.js": {
-    "bundled": 28076,
-    "minified": 12353,
-    "gzipped": 3575,
+    "bundled": 29006,
+    "minified": 13074,
+    "gzipped": 3778,
     "treeshaked": {
       "rollup": {
         "code": 208,
         "import_statements": 132
       },
       "webpack": {
-        "code": 1324
+        "code": 2207
       }
     }
   },
   "umd/history.js": {
-    "bundled": 33021,
-    "minified": 11943,
-    "gzipped": 3917
+    "bundled": 33889,
+    "minified": 12474,
+    "gzipped": 4193
   },
   "umd/history.min.js": {
-    "bundled": 30384,
-    "minified": 9993,
-    "gzipped": 3501
+    "bundled": 31154,
+    "minified": 10143,
+    "gzipped": 3541
   }
 }
diff --git a/modules/deprecate.js b/modules/deprecate.js
new file mode 100644
index 000000000..9261bfcbc
--- /dev/null
+++ b/modules/deprecate.js
@@ -0,0 +1,10 @@
+import warning from './warning.js';
+
+export default function deprecate(fn, message) {
+  let alreadyWarned = false;
+  return function() {
+    warning(alreadyWarned, message);
+    alreadyWarned = true;
+    return fn.apply(this, arguments);
+  };
+}
diff --git a/modules/index.js b/modules/index.js
index b02317ddb..48ec4f1c3 100644
--- a/modules/index.js
+++ b/modules/index.js
@@ -1,5 +1,24 @@
-export { default as createBrowserHistory } from './createBrowserHistory';
-export { default as createHashHistory } from './createHashHistory';
-export { default as createMemoryHistory } from './createMemoryHistory';
-export { createLocation, locationsAreEqual } from './LocationUtils';
-export { parsePath, createPath } from './PathUtils';
+export { default as createBrowserHistory } from './createBrowserHistory.js';
+export { default as createHashHistory } from './createHashHistory.js';
+export { default as createMemoryHistory } from './createMemoryHistory.js';
+export { parsePath, createPath } from './PathUtils.js';
+
+import deprecate from './deprecate.js';
+import { createLocation, locationsAreEqual } from './LocationUtils.js';
+
+const deprecatedCreateLocation = deprecate(
+  createLocation,
+  'createLocation is deprecated and will be removed in the next major release.' +
+    ' To create a location object from a URL string, use `location = parsePath(url)` instead.'
+);
+
+const deprecatedLocationsAreEqual = deprecate(
+  locationsAreEqual,
+  'locationsAreEqual is deprecated and will be removed in the next major release.' +
+    ' To check if two location objects represent the same location, compare `locationA.key === locationB.key` instead.'
+);
+
+export {
+  deprecatedCreateLocation as createLocation,
+  deprecatedLocationsAreEqual as locationsAreEqual
+};