diff --git a/relational-record.cabal b/relational-record.cabal
--- a/relational-record.cabal
+++ b/relational-record.cabal
@@ -1,5 +1,5 @@
 name:                relational-record
-version:             0.1.3.0
+version:             0.1.4.0
 synopsis:            Meta package of Relational Record
 description:         Meta package to install Relational Record quickly
 homepage:            http://khibino.github.io/haskell-relational-record/
diff --git a/src/Database/Relational/Query/Documentation.hs b/src/Database/Relational/Query/Documentation.hs
--- a/src/Database/Relational/Query/Documentation.hs
+++ b/src/Database/Relational/Query/Documentation.hs
@@ -100,6 +100,8 @@
 
   -- ** Maybe Projections
   -- $maybeProjection
+  just, flattenMaybe,
+
   (?!), (?!?),
   (<?.>), (<?.?>),
 
@@ -296,6 +298,11 @@
 -}
 
 {- $maybeProjection
+Some operators are provided to manage projections with 'Maybe' phantom type.
+
+'just' operator creates 'Maybe' typed projection,
+'flattenMaybe' operator joins nested 'Maybe' typed projection.
+
 'Maybe' type flavor of operators against projection path, projection and aggregation are also provided.
 
 For example,