diff --git a/src/i_introduction/_9_Extension_Functions/n09ExtensionFunctions.kt b/src/i_introduction/_9_Extension_Functions/n09ExtensionFunctions.kt
index 75506f232..d8d33003f 100644
--- a/src/i_introduction/_9_Extension_Functions/n09ExtensionFunctions.kt
+++ b/src/i_introduction/_9_Extension_Functions/n09ExtensionFunctions.kt
@@ -25,7 +25,7 @@ fun todoTask9(): Nothing = TODO(
         1.r(), Pair(1, 2).r()
     """,
     documentation = doc9(),
-    references = { 1.r(); Pair(1, 2).r(); RationalNumber(1, 9) })
+    references = { 1.r(); Pair(1, 2).r(); RationalNumber(1, 2) })
 
 data class RationalNumber(val numerator: Int, val denominator: Int)