diff --git a/README.md b/README.md
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+++ b/README.md
@@ -45,7 +45,7 @@ You can solve this by doing a three-way 
 
 In many cases, it may be easiest to go back and do these three-way tests after you have finished all of your other testing.
 
-Example: Toad Skin and Saltpeter clipped with red too low. You know that Red Sand (high red) and Toad Skin don't react, so attempt a reaction using Red Sand, Toad Skin, and Saltpeter.
+Example: Toad Skin and Saltpeter clipped with red too low. You have already tested Red Sand (high red) and Toad Skin, which don't react and Red Sand and Saltpeter, which have a reaction that doesn't reduce red. In that case, try a reaction using Red Sand, Toad Skin, and Saltpeter.
 
 ### Finishing Up