Improve cardinality, detect duplicated fields after creating tables

[erdiag.git] / README.md

diff --git a/README.md b/README.md
index f4e75d1..ef279e6 100644 (file)
--- a/README.md
+++ b/README.md
@@ -34,6 +34,12 @@ Cardinality dictionary:
 
 Special cardinalities are also available to indicate relative identification: `?R` and `1R`.
 
+And, in case of a self-relationship, symbols '>' and '<' can indicate the sense, as in
+
+       {manage}
+       Users *>
+       Users 1<
+
 To mark a weak entity, just surround its name by extra-brackets
 
        [[WeakEntity]]