diff --git a/spec/param_parser_spec.cr b/spec/param_parser_spec.cr
index ebd8da4..4c1992f 100644
--- a/spec/param_parser_spec.cr
+++ b/spec/param_parser_spec.cr
@@ -174,7 +174,7 @@ describe "ParamParser" do
       body_params.to_s.should eq("")
 
       json_params = Kemal::ParamParser.new(request).json
-      json_params.should eq({} of String => AllParamTypes)
+      json_params.should eq({} of String => Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type))
     end
   end
 
diff --git a/src/kemal/helpers/helpers.cr b/src/kemal/helpers/helpers.cr
index 38c17b3..38409be 100644
--- a/src/kemal/helpers/helpers.cr
+++ b/src/kemal/helpers/helpers.cr
@@ -79,7 +79,7 @@ def gzip(status : Bool = false)
   add_handler HTTP::DeflateHandler.new if status
 end
 
-# nodoc:
+# :nodoc:
 struct UploadFile
   getter field : String
   getter data : IO::Delimited
diff --git a/src/kemal/middleware/filters.cr b/src/kemal/middleware/filters.cr
index a348b9e..7571b2c 100644
--- a/src/kemal/middleware/filters.cr
+++ b/src/kemal/middleware/filters.cr
@@ -70,6 +70,7 @@ module Kemal::Middleware
     end
   end
 
+  # :nodoc:
   class Block
     property block : HTTP::Server::Context -> String
 
diff --git a/src/kemal/param_parser.cr b/src/kemal/param_parser.cr
index 837aa5b..0340ba1 100644
--- a/src/kemal/param_parser.cr
+++ b/src/kemal/param_parser.cr
@@ -5,11 +5,11 @@ module Kemal
   # ParamParser parses the request contents including query_params and body
   # and converts them into a params hash which you can within the environment
   # context.
-  alias AllParamTypes = Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type)
-
   class ParamParser
     URL_ENCODED_FORM = "application/x-www-form-urlencoded"
     APPLICATION_JSON = "application/json"
+    # :nodoc:
+    alias AllParamTypes = Nil | String | Int64 | Float64 | Bool | Hash(String, JSON::Type) | Array(JSON::Type)
 
     def initialize(@request : HTTP::Request)
       @url = {} of String => String
diff --git a/src/kemal/session.cr b/src/kemal/session.cr
index 02e00b6..d1e1ccc 100644
--- a/src/kemal/session.cr
+++ b/src/kemal/session.cr
@@ -15,7 +15,7 @@ module Kemal
   #
   # Sessions are pruned hourly after 48 hours of inactivity.
   class Sessions
-    # Session Types are String, Integer, Float and Boolean
+    # :nodoc:
     alias SessionTypes = String | Int32 | Float64 | Bool
 
     # In-memory, ephemeral datastore only.