diff --git a/docs/lib2x-bauer_spiral.md b/docs/lib2x-bauer_spiral.md
index d081b0f4..cc6684a6 100644
--- a/docs/lib2x-bauer_spiral.md
+++ b/docs/lib2x-bauer_spiral.md
@@ -4,6 +4,8 @@ Creates visually even spacing of n points on the surface of the sphere. Successi
 
 (It's called "visually even spacing" because only the vertices of the 5 [Platonic solids](https://en.wikipedia.org/wiki/Platonic_solid) can be said to be truly evenly spaced around the surface of a sphere.)
 
+**Since:** 2.5
+
 ## Parameters
 
 - `n` : The number of points.
diff --git a/docs/lib2x-fibonacci_lattice.md b/docs/lib2x-fibonacci_lattice.md
index e8d12eac..2b03bf00 100644
--- a/docs/lib2x-fibonacci_lattice.md
+++ b/docs/lib2x-fibonacci_lattice.md
@@ -4,6 +4,8 @@ Creates visually even spacing of n points on the surface of the sphere. Nearest-
 
 (It's called "visually even spacing" because only the vertices of the 5 [Platonic solids](https://en.wikipedia.org/wiki/Platonic_solid) can be said to be truly evenly spaced around the surface of a sphere.)
 
+**Since:** 2.5
+
 ## Parameters
 
 - `n` : The number of points.
diff --git a/docs/lib2x-vx_bezier.md b/docs/lib2x-vx_bezier.md
index f3c86351..8efa7c89 100644
--- a/docs/lib2x-vx_bezier.md
+++ b/docs/lib2x-vx_bezier.md
@@ -2,6 +2,8 @@
 
 Given 4 control points, returns voxel-by-voxel points of Bézier Curve .
 
+**Since:** 2.5
+
 ## Parameters
 
 - `p1` : The 1st control point.
diff --git a/docs/lib2x-vx_contour.md b/docs/lib2x-vx_contour.md
index 8a58eef5..cb060a2e 100644
--- a/docs/lib2x-vx_contour.md
+++ b/docs/lib2x-vx_contour.md
@@ -2,6 +2,8 @@
 
 Given a list of points that form a closed area, `vx_contour` returns the contour which encircles the area.
 
+**Since:** 2.5
+
 ## Parameters
 
 - `points` : A list of `[x, y]` points.
diff --git a/docs/lib2x-vx_curve.md b/docs/lib2x-vx_curve.md
index b56846a2..c1a6574f 100644
--- a/docs/lib2x-vx_curve.md
+++ b/docs/lib2x-vx_curve.md
@@ -2,6 +2,8 @@
 
 Draws a voxel-by-voxel curve from control points. The curve is drawn only from the 2nd control point to the second-last control point. It's a voxel version of [curve](https://openhome.cc/eGossip/OpenSCAD/lib2x-curve.html). 
 
+**Since:** 2.5
+
 ## Parameters
 
 - `points` : A list of `[x, y]` or `[x, y, z]` control points.