diff --git a/core/config/schema/core.entity.schema.yml b/core/config/schema/core.entity.schema.yml
index 63a35eb..9a5cd24 100644
--- a/core/config/schema/core.entity.schema.yml
+++ b/core/config/schema/core.entity.schema.yml
@@ -264,3 +264,65 @@ entity_view_display.field.timestamp_ago:
       label: 'Settings'
       sequence:
         - type: string
+
+# Schema for the configuration files of the string field types
+
+string.settings:
+  type: mapping
+  label: 'Text settings'
+  mapping:
+    default_summary_length:
+      type: integer
+      label: 'Default summary length'
+
+field.string.storage_settings:
+  type: mapping
+  label: 'Text settings'
+  mapping:
+    case_sensitive:
+      type: boolean
+      label: 'Case sensitive'
+    max_length:
+      type: integer
+      label: 'Maximum length'
+
+field.string.field_settings:
+  type: mapping
+  label: 'Text settings'
+  sequence:
+    - type: string
+
+field.string.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: label
+          label: 'Value'
+
+field.string_long.storage_settings:
+  label: 'Text (long) settings'
+  type: mapping
+  mapping:
+    case_sensitive:
+      type: boolean
+      label: 'Case sensitive'
+
+field.string_long.field_settings:
+  label: 'Text (long) settings'
+  type: mapping
+  mapping: {  }
+
+field.string_long.value:
+  type: sequence
+  label: 'Default value'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: string
+          label: 'Value'
diff --git a/core/modules/text/config/schema/text.schema.yml b/core/modules/text/config/schema/text.schema.yml
index f472aec..ce1d94e 100644
--- a/core/modules/text/config/schema/text.schema.yml
+++ b/core/modules/text/config/schema/text.schema.yml
@@ -12,6 +12,9 @@ field.text.storage_settings:
   type: mapping
   label: 'Text (formatted) settings'
   mapping:
+    case_sensitive:
+      type: boolean
+      label: 'Case sensitive'
     max_length:
       type: integer
       label: 'Maximum length'
@@ -39,7 +42,10 @@ field.text.value:
 field.text_long.storage_settings:
   label: 'Text (formatted, long) settings'
   type: mapping
-  mapping: {  }
+  mapping:
+    case_sensitive:
+      type: boolean
+      label: 'Case sensitive'
 
 field.text_long.field_settings:
   label: 'Text (formatted, long) settings'
@@ -63,7 +69,10 @@ field.text_long.value:
 field.text_with_summary.storage_settings:
   label: 'Text (formatted, long, with summary) settings'
   type: mapping
-  mapping: {  }
+  mapping:
+    case_sensitive:
+      type: boolean
+      label: 'Case sensitive'
 
 field.text_with_summary.field_settings:
   type: mapping