diff --git a/docs/geotext.md b/docs/geotext.md
index 0a37096..6fb09b9 100644
--- a/docs/geotext.md
+++ b/docs/geotext.md
@@ -1,6 +1,7 @@
 # Table of Contents
 
 * [flashgeotext.geotext](#flashgeotext.geotext)
+  * [GeoTextConfiguration](#flashgeotext.geotext.GeoTextConfiguration)
   * [GeoText](#flashgeotext.geotext.GeoText)
     * [\_\_init\_\_](#flashgeotext.geotext.GeoText.__init__)
     * [extract](#flashgeotext.geotext.GeoText.extract)
@@ -8,6 +9,20 @@
 <a name="flashgeotext.geotext"></a>
 # flashgeotext.geotext
 
+<a name="flashgeotext.geotext.GeoTextConfiguration"></a>
+## GeoTextConfiguration Objects
+
+```python
+class GeoTextConfiguration(BaseModel)
+```
+
+GeoText configuration
+
+**Arguments**:
+
+- `use_demo_data` _bool_ - load demo data or not, default True
+- `case_sensitive` _bool_ - case sensitive lookup, default True
+
 <a name="flashgeotext.geotext.GeoText"></a>
 ## GeoText Objects
 
@@ -29,7 +44,7 @@ span info.
 ```python
     from flashgeotext.geotext import GeoText
 
-    geotext = GeoText(use_demo_data=True)
+    geotext = GeoText()
 
     input_text = '''Shanghai. The Chinese Ministry of Finance in Shanghai said that China plans
                     to cut tariffs on $75 billion worth of goods that the country
@@ -65,14 +80,14 @@ span info.
 #### \_\_init\_\_
 
 ```python
- | __init__(use_demo_data: bool = True) -> None
+ | __init__(config: GeoTextConfiguration = GeoTextConfiguration().dict()) -> None
 ```
 
 instantiate an empty LookupDataPool, optionally/by default with demo data
 
 **Arguments**:
 
-- `use_demo_data` _bool_ - optionally use demo data, defaults to True.
+- `config` - GeoTextConfiguration = { use_demo_data: True, case_sensitive: True }.
 
 <a name="flashgeotext.geotext.GeoText.extract"></a>
 #### extract
diff --git a/docs/lookup.md b/docs/lookup.md
index 9e5d6c1..69bf653 100644
--- a/docs/lookup.md
+++ b/docs/lookup.md
@@ -158,7 +158,7 @@ Collection of KeywordProcessors from LookupData
 #### add
 
 ```python
- | add(lookup: LookupData, update: bool = False) -> None
+ | add(lookup: LookupData, update: bool = False, case_sensitive: bool = True) -> None
 ```
 
 Add LookupData to LookupDataPool
diff --git a/flashgeotext/geotext.py b/flashgeotext/geotext.py
index 39fc722..cfb219e 100644
--- a/flashgeotext/geotext.py
+++ b/flashgeotext/geotext.py
@@ -1,7 +1,23 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
 from flashgeotext.lookup import LookupDataPool
 from flashgeotext.lookup import MissingLookupDataError
 
 
+class GeoTextConfiguration(BaseModel):
+    """GeoText configuration
+
+    Args:
+    use_demo_data (bool): load demo data or not, default True
+    case_sensitive (bool): case sensitive lookup, default True
+    """
+
+    use_demo_data: Optional[bool] = True
+    case_sensitive: Optional[bool] = True
+
+
 class GeoText(LookupDataPool):
     """Extract LookupData from input text
 
@@ -16,7 +32,7 @@ class GeoText(LookupDataPool):
     ```python
         from flashgeotext.geotext import GeoText
 
-        geotext = GeoText(use_demo_data=True)
+        geotext = GeoText()
 
         input_text = '''Shanghai. The Chinese Ministry of Finance in Shanghai said that China plans
                         to cut tariffs on $75 billion worth of goods that the country
@@ -50,21 +66,23 @@ class GeoText(LookupDataPool):
 
     """
 
-    def __init__(self, use_demo_data: bool = True) -> None:
+    def __init__(
+        self, config: GeoTextConfiguration = GeoTextConfiguration().dict()
+    ) -> None:
         """ instantiate an empty LookupDataPool, optionally/by default with demo data
 
         Args:
-            use_demo_data (bool): optionally use demo data, defaults to True.
+            config: GeoTextConfiguration = { use_demo_data: True, case_sensitive: True }.
         """
         self.pool: dict = {}
 
-        if use_demo_data:
-            self._add_demo_data()
+        if config["use_demo_data"]:
+            self._add_demo_data(case_sensitive=config["case_sensitive"])
 
     def extract(self, input_text: str, span_info: bool = True) -> dict:
         """Extract LookupData from an input_text
 
-        Arguments:
+        Args:
             input_text (str): String to extract LookupData from.
             span_info (bool): Optionally, return span_info. Defaults to True.
 
@@ -94,7 +112,7 @@ def _parse_extract(self, extract_data: list, span_info: bool = True) -> dict:
         Parse flashtext.KeywordProcessor.extract_keywords() output to count occurances,
         and optionally span_info.
 
-        Arguments:
+        Args:
             extract_data (list): flashtext.KeywordProcessor.extract_keywords() return value
             span_info (bool): optionally, parse span_info
 
diff --git a/flashgeotext/lookup.py b/flashgeotext/lookup.py
index dd85480..ad6dfb6 100644
--- a/flashgeotext/lookup.py
+++ b/flashgeotext/lookup.py
@@ -47,18 +47,6 @@ class LookupValidation:
         error_count (int): Error count in validation data.
         errors (dict):
 
-        Example: {
-            "Berlin": [
-                "Berlin missing in list of synonyms",
-                "data['Berlin'] is not a list of synonyms"
-                ]
-            }
-
-    Arguments:
-        status (str): Humanreadible string containing the Error status.
-        error_count (int): Error count in validation data.
-        errors (dict):
-
         Example: {
             "Berlin": [
                 "Berlin missing in list of synonyms",
@@ -161,7 +149,9 @@ class LookupDataPool:
     def __init__(self) -> None:
         self.pool: dict = {}
 
-    def add(self, lookup: LookupData, update: bool = False) -> None:
+    def add(
+        self, lookup: LookupData, update: bool = False, case_sensitive: bool = True
+    ) -> None:
         """Add LookupData to LookupDataPool
 
         Add LookupData to LookupDataPool.
@@ -170,17 +160,18 @@ def add(self, lookup: LookupData, update: bool = False) -> None:
 
         Args:
             lookup (LookupData): LookupData to add to pool
-            update (bool): Allow update of an existing entry in LookupDataPool
+            update (bool): Allow update of an existing entry in LookupDataPool, default False
+            case_sensitive (bool): Allow case-sensitive lookup, default True
         """
         if not isinstance(lookup, LookupData):
-            raise TypeError(f"lookup has to be instance of LookupData")
+            raise TypeError("lookup has to be instance of LookupData")
 
         if lookup.name in self.pool and not update:
             raise LookupDuplicateError(
                 f"'{lookup.name}' has already been added. Set update=True to update"
             )
         else:
-            self.pool[lookup.name] = KeywordProcessor(case_sensitive=True)
+            self.pool[lookup.name] = KeywordProcessor(case_sensitive=case_sensitive)
             self.pool[lookup.name].add_keywords_from_dict(lookup.data)
 
             # if there is a script specified, then update non word boundaries with
@@ -209,7 +200,7 @@ def remove_all(self):
 
         self.pool = {}
 
-    def _add_demo_data(self):
+    def _add_demo_data(self, case_sensitive: bool = True):
         """(private) Add demo data to pool
 
         Adds DEMODATA_CITIES and DEMODATA_COUNTRIES to LookupDataPool
@@ -220,8 +211,8 @@ def _add_demo_data(self):
         countries = LookupData(
             name="countries", data=load_data_from_file(file=DEMODATA_COUNTRIES)
         )
-        self.add(cities)
-        self.add(countries)
+        self.add(cities, case_sensitive=case_sensitive)
+        self.add(countries, case_sensitive=case_sensitive)
         logger.debug(f"demo data loaded for: {list(self.pool.keys())}")
 
 
diff --git a/readme.md b/readme.md
index 125b11e..d356318 100644
--- a/readme.md
+++ b/readme.md
@@ -20,7 +20,7 @@ Extract and count countries and cities (+their synonyms) from text, like [GeoTex
 ```python
 from flashgeotext.geotext import GeoText
 
-geotext = GeoText(use_demo_data=True)
+geotext = GeoText()
 
 input_text = '''Shanghai. The Chinese Ministry of Finance in Shanghai said that China plans
                 to cut tariffs on $75 billion worth of goods that the country
diff --git a/tests/conftest.py b/tests/conftest.py
index 2e09666..f30d369 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -18,4 +18,4 @@ def test_data_countries():
 
 @pytest.fixture
 def geotext():
-    return GeoText(use_demo_data=True)
+    return GeoText()
diff --git a/tests/integration/test_geotext_extractor.py b/tests/integration/test_geotext_extractor.py
index 0342f12..a949e35 100644
--- a/tests/integration/test_geotext_extractor.py
+++ b/tests/integration/test_geotext_extractor.py
@@ -8,7 +8,7 @@
 
 
 def test_geotext_demo_data():
-    geotext = GeoText(use_demo_data=True)
+    geotext = GeoText()
 
     assert geotext.pool["cities"]
     assert geotext.pool["countries"]
@@ -20,7 +20,7 @@ def test_geotext_extract(geotext):
 
 
 def test_geotext_raises_on_empty_pool():
-    output = GeoText(use_demo_data=False)
+    output = GeoText(config={"use_demo_data": False})
 
     with pytest.raises(MissingLookupDataError):
         output.extract(text)
@@ -39,6 +39,16 @@ def test_geotext_extract_with_count_span_info_false(geotext):
         assert output["cities"]["Berlin"]["span_info"] == [(0, 6), (43, 49)]
 
 
+def test_geotext_case_sensitive_demo_data():
+    geotext = GeoText(config={"use_demo_data": True, "case_sensitive": False})
+    text = "berlin ist ne tolle stadt"
+    output = geotext.extract(input_text=text, span_info=True)
+
+    print(output)
+
+    assert output["cities"]["Berlin"]["span_info"] == [(0, 6)]
+
+
 # tests used in geotext (https://github.com/elyase/geotext)
 
 
@@ -161,7 +171,7 @@ def test_geotext_with_script_added_to_non_word_boundaries():
     cyrillic = LookupData(
         name="test_1", data={"Нижневартовск": ["Нижневартовск"]}, script="cyrillic"
     )
-    geotext = GeoText(use_demo_data=False)
+    geotext = GeoText(config={"use_demo_data": False})
     geotext.add(cyrillic)
 
     text = """