diff --git a/docs/lib3x-m_transpose.md b/docs/lib3x-m_transpose.md
index 151aed6f..2b7809d5 100644
--- a/docs/lib3x-m_transpose.md
+++ b/docs/lib3x-m_transpose.md
@@ -2,7 +2,7 @@
 
 It transposes a matrix.
 
-**Since:** 2.4
+**Since:** 3.1
 
 ## Parameters