diff --git a/exercises/resistor-color-duo/.meta/version b/exercises/resistor-color-duo/.meta/version
index 227cea21..7ec1d6db 100644
--- a/exercises/resistor-color-duo/.meta/version
+++ b/exercises/resistor-color-duo/.meta/version
@@ -1 +1 @@
-2.0.0
+2.1.0
diff --git a/exercises/resistor-color-duo/example.sh b/exercises/resistor-color-duo/example.sh
index 93693673..10862ca9 100644
--- a/exercises/resistor-color-duo/example.sh
+++ b/exercises/resistor-color-duo/example.sh
@@ -18,13 +18,14 @@ code() {
     if [[ -n $code ]]; then
         echo "$code"
     else
-        echo "invalid color" >&2
+        echo "invalid color: $1" >&2
         return 1
     fi
 }
 
+# silently ignore extra colors
 result=""
-for color; do 
+for color in "$1" "$2"; do 
     if code=$(code "$color"); then
         result+="$code"
     else
diff --git a/exercises/resistor-color-duo/resistor_color_duo_test.sh b/exercises/resistor-color-duo/resistor_color_duo_test.sh
index 1f8823aa..86d7d81d 100644
--- a/exercises/resistor-color-duo/resistor_color_duo_test.sh
+++ b/exercises/resistor-color-duo/resistor_color_duo_test.sh
@@ -32,5 +32,12 @@
     [[ $BATS_RUN_SKIPPED == true  ]] || skip
     run bash resistor_color_duo.sh foo
     [[ $status -eq 1 ]]
-    [[ $output == "invalid color" ]]
+    [[ $output == *"invalid color"* ]]
+}
+
+@test "ignore too many colors" {
+    [[ $BATS_RUN_SKIPPED == true  ]] || skip
+    run bash resistor_color_duo.sh green brown orange
+    [[ $status -eq 0 ]]
+    [[ $output == "51" ]]
 }