diff --git a/setup.cfg b/setup.cfg
index 9c329514..ce6b7fa8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,7 +2,7 @@
 define=PSYCOPG_EXTENSIONS,PSYCOPG_DISPLAY_SIZE,PSYCOPG_NEW_BOOLEAN,HAVE_PQFREEMEM,HAVE_PQPROTOCOL3
 # PSYCOPG_EXTENSIONS enables extensions to PEP-249 (you really want this)
 # PSYCOPG_DISPLAY_SIZE enable display size calculation (a little slower)
-# HAVE_PQFREEMEM should be defined on PostgreSQL >= 7.3
+# HAVE_PQFREEMEM should be defined on PostgreSQL >= 7.4
 # HAVE_PQPROTOCOL3 should be defined on PostgreSQL >= 7.4
 # PSYCOPG_DEBUG can be added to enable verbose debug information
 # PSYCOPG_OWN_QUOTING can be added, but it is deprecated (will go away in 2.1)