diff --git a/exercises/resistor-color-duo/canonical-data.json b/exercises/resistor-color-duo/canonical-data.json
index 2031d75c75..8eea12e842 100644
--- a/exercises/resistor-color-duo/canonical-data.json
+++ b/exercises/resistor-color-duo/canonical-data.json
@@ -1,6 +1,6 @@
 {
   "exercise": "resistor-color-duo",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "cases": [
     {
       "description": "Brown and black",
@@ -33,6 +33,14 @@
         "colors": ["orange", "orange"]
       },
       "expected": 33
+    },
+    {
+      "description": "Ignore additional colors",
+      "property": "value",
+      "input": {
+        "colors": ["green", "brown", "orange"]
+      },
+      "expected": 51
     }
   ]
 }
diff --git a/exercises/resistor-color-duo/description.md b/exercises/resistor-color-duo/description.md
index b060cd5e89..6d10075c61 100644
--- a/exercises/resistor-color-duo/description.md
+++ b/exercises/resistor-color-duo/description.md
@@ -2,9 +2,10 @@ If you want to build something using a Raspberry Pi, you'll probably use _resist
 
 * Each resistor has a resistance value.
 * Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
-To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values. Each band acts as a digit of a number. For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
+To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values. Each band has a position and a numeric value. For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
+
+In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands. The program will take color names as input and output a two digit number, even if the input is more than two colors!
 
-In this exercise, you are going to create a helpful program so that you don't have to remember the values of the bands. The program will take two colors as input, and output the correct number.
 
 The band colors are encoded as follows:
 
@@ -18,3 +19,8 @@ The band colors are encoded as follows:
 - Violet: 7
 - Grey: 8
 - White: 9
+
+From the example above:
+brown-green should return 15
+brown-green-violet should return 15 too, ignoring the third color.
+