diff --git a/src/main/java/com/zaxxer/hikari/proxy/CallableStatementProxy.java b/src/main/java/com/zaxxer/hikari/proxy/CallableStatementProxy.java
index 9cd50236..8f73f586 100644
--- a/src/main/java/com/zaxxer/hikari/proxy/CallableStatementProxy.java
+++ b/src/main/java/com/zaxxer/hikari/proxy/CallableStatementProxy.java
@@ -19,6 +19,23 @@ package com.zaxxer.hikari.proxy;
 import java.sql.CallableStatement;
 
 /**
+ * This is the proxy class for java.sql.CallableStatement.  It is used in two ways:
+ * 
+ *  1) If instrumentation is not used, Javassist will generate a new class
+ *     that extends this class and delegates all method calls to the 'delegate'
+ *     member (which points to the real Connection).
+ *
+ *  2) If instrumentation IS used, Javassist will be used to inject all of
+ *     the &HikariInject and &HikariOverride annotated fields and methods
+ *     of this class into the actual CallableStatement implementation provided by the
+ *     JDBC driver.  In order to avoid name conflicts some of the fields and
+ *     methods are prefixed with _ or __.
+ *     
+ *     Methods prefixed with __, like __executeQuery() are especially
+ *     important because when we inject out own executeQuery() into the
+ *     target implementation, the original method is renamed to __executeQuery()
+ *     so that the call operates the same whether delegation or instrumentation
+ *     is used.
  *
  * @author Brett Wooldridge
  */
@@ -33,6 +50,7 @@ public abstract class CallableStatementProxy extends PreparedStatementProxy impl
     //               Overridden java.sql.CallableStatement Methods
     // **********************************************************************
 
+
     // ***********************************************************************
     // These methods contain code we do not want injected into the actual
     // java.sql.Connection implementation class.  These methods are only