diff --git a/lib/core/logs.rb b/lib/core/logs.rb
index 4d81058..5b21c18 100644
--- a/lib/core/logs.rb
+++ b/lib/core/logs.rb
@@ -1,14 +1,16 @@
 module Rpl
-  module Core
-    module_function
+  module Lang
+    module Core
+      module_function
 
-    # Euler constant
-    def e( stack, dictionary )
-      stack << { type: :numeric,
-                 base: 10,
-                 value: BigMath.E( Rpl::Core.precision ) }
+      # Euler constant
+      def e( stack, dictionary )
+        stack << { type: :numeric,
+                   base: 10,
+                   value: BigMath.E( Rpl::Core.precision ) }
 
-      [stack, dictionary]
+        [stack, dictionary]
+      end
     end
   end
 end
diff --git a/lib/core/trig.rb b/lib/core/trig.rb
index ed75a46..993de6d 100644
--- a/lib/core/trig.rb
+++ b/lib/core/trig.rb
@@ -1,14 +1,16 @@
 module Rpl
-  module Core
-    module_function
+  module Lang
+    module Core
+      module_function
 
-    # pi constant
-    def pi( stack, dictionary )
-      stack << { type: :numeric,
-                 base: 10,
-                 value: BigMath.PI( Rpl::Core.precision ) }
+      # pi constant
+      def pi( stack, dictionary )
+        stack << { type: :numeric,
+                   base: 10,
+                   value: BigMath.PI( Rpl::Core.precision ) }
 
-      [stack, dictionary]
+        [stack, dictionary]
+      end
     end
   end
 end