diff --git a/docs/guide/use_cases/data_cleaning.md b/docs/guide/ai_functions/data.md
similarity index 99%
rename from docs/guide/use_cases/data_cleaning.md
rename to docs/guide/ai_functions/data.md
index e6cc5208e..7f2936043 100644
--- a/docs/guide/use_cases/data_cleaning.md
+++ b/docs/guide/ai_functions/data.md
@@ -1,4 +1,4 @@
-# Data cleaning
+# AI Functions for data
 
 > "Data cleaning is 80% of data science."
 >
@@ -172,7 +172,7 @@ The Python string method [`.title()`](https://docs.python.org/3/library/stdtypes
 
 ```python
 
-from marvin.ai_functions.data import title_case
+from marvin.ai_functions.strings import title_case
 
 title_case("the european went over to canada, eh?")
 # The European Went Over to Canada, Eh?
diff --git a/docs/guide/ai_functions/strings.md b/docs/guide/ai_functions/strings.md
new file mode 100644
index 000000000..23ca57338
--- /dev/null
+++ b/docs/guide/ai_functions/strings.md
@@ -0,0 +1,16 @@
+# AI Functions for strings
+
+## Actual title case
+
+Return a title case string that you would want to use in a title.
+
+The Python string method [`.title()`](https://docs.python.org/3/library/stdtypes.html#str.title) makes the first letter of every word uppercase and the remaing letters lowercase. This result isn't what you want to use for the title of a piece of writing, generally. `title_case` takes a string and returns a string you can use in a title.
+
+```python
+
+from marvin.ai_functions.strings import title_case
+
+title_case("the european went over to canada, eh?")
+# The European Went Over to Canada, Eh?
+```
+
diff --git a/docs/guide/concepts/ai_functions.md b/docs/guide/concepts/ai_functions.md
index ac07be124..649f9debb 100644
--- a/docs/guide/concepts/ai_functions.md
+++ b/docs/guide/concepts/ai_functions.md
@@ -220,7 +220,7 @@ fix_sentence("he go to mcdonald and buy burg") # "He goes to McDonald's and buys
 ```
 
 ### Cleaning data
-Cleaning data is such an important use case that Marvin has an entire module dedicated to it, including AI functions for categorization, standardization, entity extraction, and context-aware fills for missing values. See [the data cleaning documentation](/guide/use_cases/data_cleaning) for more information.
+Cleaning data is such an important use case that Marvin has an entire module dedicated to it, including AI functions for categorization, standardization, entity extraction, and context-aware fills for missing values. See [the data cleaning documentation](/guide/ai_functions/data) for more information.
 ### Unit testing LLMs
 One of the difficulties of building an AI library is unit testing it! While it's possible to make LLM outputs deterministic by setting the temperature to zero, a small change to a prompt could result in very different outputs. Therefore, we want a way to assert that an LLM's output is "approximately equal" to an expected value.
 
diff --git a/mkdocs.yml b/mkdocs.yml
index e7b944c5a..fb479374f 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -22,8 +22,10 @@ nav:
       - Loaders: guide/concepts/loaders_and_documents.md
       - Infrastructure: guide/concepts/infra.md
       - Plugins: guide/concepts/plugins.md
+    - AI Functions:
+      - Data: guide/ai_functions/data.md
+      - Strings: guide/ai_functions/strings.md
     - Use Cases:
-      - Data cleaning: guide/use_cases/data_cleaning.md
       - Enforcing LLM output formats: guide/use_cases/enforcing_format.md
       - Slackbot: guide/use_cases/slackbot.md
     - Development:
diff --git a/src/marvin/ai_functions/__init__.py b/src/marvin/ai_functions/__init__.py
index 698ae3264..f5e37001a 100644
--- a/src/marvin/ai_functions/__init__.py
+++ b/src/marvin/ai_functions/__init__.py
@@ -1 +1,3 @@
 from .base import ai_fn
+
+from . import data, strings
diff --git a/src/marvin/ai_functions/data.py b/src/marvin/ai_functions/data.py
index ac41033fb..3313ea4ff 100644
--- a/src/marvin/ai_functions/data.py
+++ b/src/marvin/ai_functions/data.py
@@ -1,6 +1,6 @@
 from typing import TYPE_CHECKING
 
-from marvin import ai_fn
+from marvin.ai_functions import ai_fn
 
 if TYPE_CHECKING:
     from pandas import DataFrame
@@ -58,10 +58,3 @@ def standardize(data: list[str], format: str) -> list[str]:
     Given a list of data, standardize the data to the given format. For example,
     the format could be "phone number", "sentence case", "ISO date", etc.
     """
-
-
-@ai_fn
-def title_case(input: str) -> str:
-    """
-    Given a string {input} change the case to make it APA style guide title case.
-    """
diff --git a/src/marvin/ai_functions/strings.py b/src/marvin/ai_functions/strings.py
new file mode 100644
index 000000000..94827815f
--- /dev/null
+++ b/src/marvin/ai_functions/strings.py
@@ -0,0 +1,8 @@
+from marvin.ai_functions import ai_fn
+
+
+@ai_fn
+def title_case(input: str) -> str:
+    """
+    Given a string {input} change the case to make it APA style guide title case.
+    """
diff --git a/tests/llm_tests/ai_functions/test_data.py b/tests/llm_tests/ai_functions/test_data.py
index 3f5022bbb..372897a62 100644
--- a/tests/llm_tests/ai_functions/test_data.py
+++ b/tests/llm_tests/ai_functions/test_data.py
@@ -135,12 +135,3 @@ def test_standardize_case(self):
             format="Proper case",
         )
         assert result == ["Brown Cow", "Small Dog", "Big Cat", "Medium-Sized Bird"]
-
-
-class TestTitleCase:
-    def test_short_prepositions_not_capitalized(self):
-        result = data_fns.title_case(
-            input="let me go to the store",
-        )
-
-        assert result == "Let Me Go to the store"
diff --git a/tests/llm_tests/ai_functions/test_strings.py b/tests/llm_tests/ai_functions/test_strings.py
new file mode 100644
index 000000000..2d6652b8a
--- /dev/null
+++ b/tests/llm_tests/ai_functions/test_strings.py
@@ -0,0 +1,10 @@
+from marvin.ai_functions import strings as string_fns
+
+
+class TestTitleCase:
+    def test_short_prepositions_not_capitalized(self):
+        result = string_fns.title_case(
+            input="let me go to the store",
+        )
+
+        assert result == "Let Me Go to the store"