diff --git a/src/1_complex_numbers.md b/src/1_complex_numbers.md
index 6af7cfe1f2368867e2d0243c08d8bc4e19a1f2cd..bb163865b3e4241be15e04edbfe609c98f5991b4 100644
--- a/src/1_complex_numbers.md
+++ b/src/1_complex_numbers.md
@@ -6,9 +6,9 @@ title: Complex Numbers
 
 The lecture on complex numbers consists of three parts, each with their own video:
 
-- [1.1. Definition and basic operations](#1.1.-definition-and-basic-operations)
-- [1.2. Complex functions](#1.2.-complex-functions)
-- [1.3. Differentiation and integration](#1.3.-differentiation-and-integration)
+- [1.1. Definition and basic operations](#11-definition-and-basic-operations)
+- [1.2. Complex functions](#12-complex-functions)
+- [1.3. Differentiation and integration](#13-differentiation-and-integration)
 
 **Total video length: 38 minutes and 53 seconds**
 
diff --git a/src/2_coordinates.md b/src/2_coordinates.md
index d955febe18fc91d2821b68f2689ac2386a28382e..c08ebaa39f8903b29c84b4dbb5d30bd82f16dae5 100644
--- a/src/2_coordinates.md
+++ b/src/2_coordinates.md
@@ -5,9 +5,9 @@ title: Coordinates
 
 The lecture on coordinate systems consists of 3 parts, each with their own video:
 
-- [2.1. Introduction to coordinate systems: Cartesian and polar](#2.1.-introduction-to-coordinate-systems-cartesian-and-polar)
-- [2.2. Converting derivatives between coordinate systems](#2.2.-converting-derivatives-between-coordinate-systems)
-- [2.3. Coordinate systems in 3D](#2.3.-coordinate-systems-in-3d)
+- [2.1. Introduction to coordinate systems: Cartesian and polar](#21-introduction-to-coordinate-systems-cartesian-and-polar)
+- [2.2. Converting derivatives between coordinate systems](#22-converting-derivatives-between-coordinate-systems)
+- [2.3. Coordinate systems in 3D](#23-coordinate-systems-in-3d)
 
 **Total video length: 35 minutes and 13 seconds**