diff --git a/nucleotide-count.md b/nucleotide-count.md
index 7c3b6fc3b8..bc8be6f1a2 100644
--- a/nucleotide-count.md
+++ b/nucleotide-count.md
@@ -14,7 +14,6 @@ I'm not going to talk about lipids because they're crazy complex.
 
 So back to nucleotides.
 
-There are 5 types of nucleotides. 4 of these occur in DNA: `A`, `C`, `G`, and `T`. 4 occur in RNA: `A`, `C`, `G`, `U`.
-
-There are no other nucleotides.
+DNA contains four types of them: adenine (`A`), cytosine (`C`), guanine (`G`), and thymine (`T`).
 
+RNA contains a slightly different set of nucleotides but we don't care about that for now.