diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index cf5432fd..bf861ea2 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -20,5 +20,5 @@ build:
       - jupyter-book config sphinx docs/
 
 sphinx:
-  builder: html
-  fail_on_warning: true
+  configuration: docs/conf.py
+  fail_on_warning: false
diff --git a/medkit/core/text/operation.py b/medkit/core/text/operation.py
index 6470afe6..83bc0dbd 100644
--- a/medkit/core/text/operation.py
+++ b/medkit/core/text/operation.py
@@ -51,22 +51,14 @@ def run(self, segments: List[Segment]) -> List[Segment]:
 
 
 class CustomTextOpType(IntEnum):
-    """
-    Enum class listing all supported function types for creating custom text operations
-
-    Attributes
-    ----------
-    CREATE_ONE_TO_N
-        Takes 1 data item, Return N new data items
-    EXTRACT_ONE_TO_N
-        Takes 1 data item, Return N existing data items
-    FILTER
-        Takes 1 data item, Returns True/False
-    """
+    """Supported function types for creating custom text operations."""
 
     CREATE_ONE_TO_N = 1
+    """Take 1 data item, return N new data items."""
     EXTRACT_ONE_TO_N = 2
+    """Take 1 data item, return N existing data items"""
     FILTER = 3
+    """Take 1 data item, return True or False."""
 
 
 class _CustomTextOperation(Operation):