diff --git a/docs/2_coordinates.md b/docs/2_coordinates.md
index 6022b3c0511ac8634f05aecacaa5734085b599f5..b668087cd9c9bca735e09b88da41c5daf2d36d3b 100644
--- a/docs/2_coordinates.md
+++ b/docs/2_coordinates.md
@@ -1,5 +1,5 @@
 ---
-title: Coordinates
+title: Coordinate systems
 ---
 # 2. Coordinate systems
 
diff --git a/docs/5_operators_QM.md b/docs/5_operators_QM.md
index 1afd331b6f64256cacfc16ded67625d926dd8e1c..befc306a6d675ac5999152e1ae86921b63fffef2 100644
--- a/docs/5_operators_QM.md
+++ b/docs/5_operators_QM.md
@@ -1,5 +1,5 @@
 ---
-title: Operators quantum mechanics
+title: Operators in quantum mechanics
 ---
 
 # 5. Operators in quantum mechanics
diff --git a/docs/7_differential_equations_1.md b/docs/7_differential_equations_1.md
index ea9d3d4429a24455123d18cccaf7cc3b6788453b..f2ce3dff384287e12d07d0e1c3863ddf6bbe8d37 100644
--- a/docs/7_differential_equations_1.md
+++ b/docs/7_differential_equations_1.md
@@ -1,5 +1,5 @@
 ---
-title: Differential Equations
+title: Differential Equations: Part 1
 ---
 
 #7. Differential equations: Part 1
diff --git a/docs/8_differential_equations_2.md b/docs/8_differential_equations_2.md
index 1549a8423a48feb6415760d6c0569e120e2577cf..c1993bd49f6bbcc47d78fd755e91c3621958ae17 100644
--- a/docs/8_differential_equations_2.md
+++ b/docs/8_differential_equations_2.md
@@ -1,5 +1,5 @@
 ---
-title: 8. Differential equations: Part 2
+title: Differential equations: Part 2
 ---
 
 #8. Differential equations: Part 2