diff --git a/googlemaps/distance_matrix.py b/googlemaps/distance_matrix.py
index a30cbe0..ceeddac 100755
--- a/googlemaps/distance_matrix.py
+++ b/googlemaps/distance_matrix.py
@@ -51,7 +51,8 @@ def distance_matrix(client, origins, destinations,
     :type language: string
 
     :param avoid: Indicates that the calculated route(s) should avoid the
-        indicated features. Valid values are "tolls", "highways" or "ferries".
+        indicated features. Valid values are "tolls", "highways", "indoor" or "ferries"
+        as well as any combination of them separated by "|".
     :type avoid: string
 
     :param units: Specifies the unit system to use when displaying results.
@@ -107,8 +108,12 @@ def distance_matrix(client, origins, destinations,
         params["language"] = language
 
     if avoid:
-        if avoid not in ["tolls", "highways", "ferries"]:
-            raise ValueError("Invalid route restriction.")
+        valid_avoids = ["tolls", "highways", "indoor", "ferries"]
+        avoid_tokens = avoid.split("|")
+        for token in avoid_tokens:
+            if token not in valid_avoids:
+                raise ValueError("Invalid route restriction.")
+            valid_avoids.remove(token)
         params["avoid"] = avoid
 
     if units: