diff --git a/src/sssom/constants.py b/src/sssom/constants.py
index aa99aaec..41e323a7 100644
--- a/src/sssom/constants.py
+++ b/src/sssom/constants.py
@@ -181,7 +181,10 @@
 
 
 class SEMAPV(Enum):
-    """SEMAPV Enum containing different mapping_justification."""
+    """SEMAPV Enum containing different mapping_justification.
+
+    See also: https://mapping-commons.github.io/semantic-mapping-vocabulary/#matchingprocess
+    """
 
     LexicalMatching = "semapv:LexicalMatching"
     LogicalReasoning = "semapv:LogicalReasoning"