diff --git a/guide/english/mathematics/golden-ratio/index.md b/guide/english/mathematics/golden-ratio/index.md
index f98643190d1..2363885e65d 100644
--- a/guide/english/mathematics/golden-ratio/index.md
+++ b/guide/english/mathematics/golden-ratio/index.md
@@ -12,6 +12,8 @@ Given a > b > 0,
 
 The golden ratio is irrational, and can be represented as (1 + √5)/2.
 
+The golden ratio is unique in that it is the only number where the inverse of the number is equal to the number minus 1 (as in, 1/φ = φ - 1).
+
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