diff --git a/README.md b/README.md
index 33140b4..6412401 100644
--- a/README.md
+++ b/README.md
@@ -750,4 +750,6 @@ The following guidelines indicate when the use of an index should be reconsidere
     ALTER TABLE table_name 
     ADD CONSTRAINT MyUniqueConstraint CHECK (CONDITION);
 
+### ADD PRIMARY KEY
 
+