docs: add fast exponentiation operator ** to README

1 files changed, 3 insertions, 0 deletions

diff --git a/README.md b/README.md
index 51735b8..ce0a01e 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,9 @@ gt '20 4 /'          # 20 / 4 = 5
 gt '2 3 ^'           # 2^3 = 8
 # → 8
 
+gt '2 10 **'          # 2^10 = 1024 (Fast binary exponentiation)
+# → 1024
+
 gt '10 3 %'          # 10 % 3 = 1 (modulo)
 # → 1
 ```