doc: Update SHOW DATABASES documentation

Documentation of reserve_pool was missing.

fixes #322

diff --git a/doc/usage.rst b/doc/usage.rst
index 3e7726b3289fa750a8c57c93a17bd24dd92398d4..7f14f07005022a08c4e2ee7397b5753a832e059f 100644 (file)
--- a/doc/usage.rst
+++ b/doc/usage.rst
@@ -471,6 +471,9 @@ force_user
 pool_size
     Maximum number of server connections.
 
+reserve_pool
+    Maximum number of additional connections for this database.
+
 pool_mode
     The database's override pool_mode, or NULL if the default will be used instead.