diff --git a/README.md b/README.md
index fa8d4eb..1125321 100644
--- a/README.md
+++ b/README.md
@@ -763,4 +763,6 @@ The following guidelines indicate when the use of an index should be reconsidere
     ALTER TABLE table_name 
     DROP INDEX MyUniqueConstraint;
 
+### DROP PRIMARY KEY
 
+