diff --git a/schemas/src/defs/v1.2/properties/optimade/structures/assemblies.yaml b/schemas/src/defs/v1.2/properties/optimade/structures/assemblies.yaml
index 7a945d4dd..ac655d40c 100644
--- a/schemas/src/defs/v1.2/properties/optimade/structures/assemblies.yaml
+++ b/schemas/src/defs/v1.2/properties/optimade/structures/assemblies.yaml
@@ -113,7 +113,7 @@ examples:
 x-optimade-unit: "inapplicable"
 properties:
   sites_in_groups:
-    title: "Sites in groups"
+    title: "sites in groups"
     x-optimade-type: "list"
     x-optimade-dimensions:
       names: ["dim_assembly_groups", "dim_assembly_groups_sites"]
@@ -131,7 +131,7 @@ properties:
       - [[1,2], [3]]
     x-optimade-unit: "inapplicable"
     items:
-      title: "Group of sites"
+      title: "group of sites"
       x-optimade-type: "list"
       x-optimade-dimensions:
         names: ["dim_assembly_groups_sites"]
@@ -144,7 +144,7 @@ properties:
         - [1,2]
       x-optimade-unit: "inapplicable"
       items:
-        title: "A site reference"
+        title: "a site reference"
         x-optimade-type: "integer"
         type:
           - "integer"
@@ -154,7 +154,7 @@ properties:
           - 2
         x-optimade-unit: "inapplicable"
   group_probabilities:
-    title: "Group probabilities"
+    title: "group probabilities"
     x-optimade-type: "list"
     x-optimade-dimensions:
         names: ["dim_assembly_groups"]
@@ -172,7 +172,7 @@ properties:
       - [0.3, 0.7]
     x-optimade-unit: "inapplicable"
     items:
-      title: "A concentration"
+      title: "a concentration"
       x-optimade-type: "float"
       type:
         - "number"
diff --git a/schemas/src/defs/v1.2/properties/optimade/structures/cartesian_site_positions.yaml b/schemas/src/defs/v1.2/properties/optimade/structures/cartesian_site_positions.yaml
index 136ce51d1..f9efe02c7 100644
--- a/schemas/src/defs/v1.2/properties/optimade/structures/cartesian_site_positions.yaml
+++ b/schemas/src/defs/v1.2/properties/optimade/structures/cartesian_site_positions.yaml
@@ -1,6 +1,6 @@
 $$schema: "https://schemas.optimade.org/meta/v1.2/optimade/property_definition"
 $id: "https://schemas.optimade.org/defs/v1.2/properties/optimade/structures/cartesian_site_positions"
-title: "cartesian site positions"
+title: "Cartesian site positions"
 x-optimade-type: "list"
 x-optimade-definition:
   label: "cartesian_site_positions_optimade_structures"
diff --git a/schemas/src/defs/v1.2/properties/optimade/structures/species.yaml b/schemas/src/defs/v1.2/properties/optimade/structures/species.yaml
index feee2bb76..03eb82792 100644
--- a/schemas/src/defs/v1.2/properties/optimade/structures/species.yaml
+++ b/schemas/src/defs/v1.2/properties/optimade/structures/species.yaml
@@ -75,7 +75,7 @@ examples:
   - [ {"name": "CH3", "chemical_symbols": ["C"], "concentration": [1.0], "attached": ["H"], "nattached": [3]} ]
 x-optimade-unit: "inapplicable"
 items:
-  title: "Species declaration"
+  title: "species declaration"
   x-optimade-type: "dictionary"
   description: |-
     A declaration of a species of the sites of this structure. Species can represent pure chemical elements, virtual-crystal atoms representing a statistical occupation of a given site by multiple chemical elements, and/or a location to which there are attached atoms, i.e., atoms whose precise location are unknown beyond that they are attached to that position (frequently used to indicate hydrogen atoms attached to another element, e.g., a carbon with three attached hydrogens might represent a methyl group, -CH3).
@@ -86,7 +86,7 @@ items:
     name:
       $$inherit: "/v1.2/properties/optimade/common/species_name"
     chemical_symbols:
-      title: "Chemical symbols"
+      title: "chemical symbols"
       x-optimade-type: "list"
       x-optimade-dimensions:
           names: ["dim_species_chemical_symbols"]
@@ -112,7 +112,7 @@ items:
       items:
         $$inherit: "/v1.2/properties/optimade/common/chemical_symbol_or_vacancy"
     concentration:
-      title: "Concentration"
+      title: "concentration"
       x-optimade-type: "list"
       x-optimade-dimensions:
           names: ["dim_species_chemical_symbols"]
@@ -142,7 +142,7 @@ items:
         minimum: 0.0
         maximum: 1.0
     attached:
-      title: "Attached chemical symbols"
+      title: "attached chemical symbols"
       x-optimade-type: "list"
       x-optimade-dimensions:
           names: ["dim_species_attached"]
@@ -167,7 +167,7 @@ items:
       items:
         $$inherit: "/v1.2/properties/optimade/common/chemical_symbol"
     nattached:
-      title: "Number of attached entities"
+      title: "number of attached entities"
       x-optimade-type: "list"
       x-optimade-dimensions:
           names: ["dim_species_attached"]
@@ -190,7 +190,7 @@ items:
         x-optimade-unit: "dimensionless"
         minimum: 0
     mass:
-      title: "Masses of the entities composing the species"
+      title: "masses of the entities composing the species"
       x-optimade-type: "list"
       x-optimade-dimensions:
         names: ["dim_species_chemical_symbols"]
@@ -212,7 +212,7 @@ items:
         x-optimade-unit: "dalton"
         minimum: 0.0
     original_name:
-      title: "Original name"
+      title: "original name"
       x-optimade-type: "string"
       type:
         - "string"