diff --git a/src/compiler/GF/Command/Abstract.hs b/src/compiler/GF/Command/Abstract.hs
index ebf6bc29b..e1b4c5871 100644
--- a/src/compiler/GF/Command/Abstract.hs
+++ b/src/compiler/GF/Command/Abstract.hs
@@ -16,10 +16,12 @@ data Command
 data TransactionCommand
    = CreateFun [Option] Fun Type
    | CreateCat [Option] Cat [Hypo]
+   | CreateConcrete [Option] ConcName
    | CreateLin [Option] Fun Term
    | CreateLincat [Option] Cat Term
    | DropFun [Option] Fun
    | DropCat [Option] Cat
+   | DropConcrete [Option] ConcName
    | DropLin [Option] Fun
    | DropLincat [Option] Cat
    deriving Show
diff --git a/src/compiler/GF/Command/Commands.hs b/src/compiler/GF/Command/Commands.hs
index c06df6865..0578f4c1e 100644
--- a/src/compiler/GF/Command/Commands.hs
+++ b/src/compiler/GF/Command/Commands.hs
@@ -684,10 +684,10 @@ pgfCommands = Map.fromList [
      }),
   ("c", emptyCommandInfo {
      longname = "create",
-     syntax = "create fun f = ..; create cat c = ..; create lin c = ..; or create lincat c = ..",
-     synopsis = "Dynamically adds new functions and categories to the current grammar.",
+     syntax = "create fun f = ..; create cat c = ..; create concrete l; create lin c = ..; or create lincat c = ..",
+     synopsis = "Dynamically adds new functions, categories and languages to the current grammar.",
      explanation = unlines [
-       "After the command you can write fun, data, cat, lin or a lincat definition.",
+       "After the command you can write fun, data, cat, concrete, lin or a lincat definition.",
        "The syntax is the same as if the definition was in a module. If you want to use",
        "any operations inside lin and lincat, you should import them",
        "by using the command `i -resource <file path>`."
@@ -700,11 +700,11 @@ pgfCommands = Map.fromList [
      }),
   ("d", emptyCommandInfo {
      longname = "drop",
-     syntax = "drop fun f; drop cat c; drop lin c; or drop lincat c",
-     synopsis = "Dynamically removes functions and categories from the current grammar.",
+     syntax = "drop fun f; drop cat c; drop concrete l; drop lin c; or drop lincat c",
+     synopsis = "Dynamically removes functions, categories and languages from the current grammar.",
      explanation = unlines [
        "After the command you must specify whether you want to remove",
-       "fun, data, cat, lin or a lincat definition.",
+       "fun, data, cat, concrete, lin or a lincat definition.",
        "Note that if you are removing an abstract function or category,",
        "then all corresponding linearizations will be dropped as well."
        ],
diff --git a/src/compiler/GF/Command/Parse.hs b/src/compiler/GF/Command/Parse.hs
index 31cb13abf..bd5920890 100644
--- a/src/compiler/GF/Command/Parse.hs
+++ b/src/compiler/GF/Command/Parse.hs
@@ -75,6 +75,13 @@ pTransactionCommand = do
           | take 1 cmd == "d" -> do
                 c <- pIdent
                 return (DropCat opts c)
+    "concrete"
+          | take 1 cmd == "c" -> do
+               name <- pIdent
+               return (CreateConcrete opts name)
+          | take 1 cmd == "d" -> do
+               name <- pIdent
+               return (DropConcrete opts name)
     "lin" | take 1 cmd == "c" -> do
                f <- pIdent
                skipSpaces
diff --git a/src/compiler/GF/Interactive.hs b/src/compiler/GF/Interactive.hs
index c9db4683b..0cbe23faf 100644
--- a/src/compiler/GF/Interactive.hs
+++ b/src/compiler/GF/Interactive.hs
@@ -242,6 +242,9 @@ transactionCommand (CreateCat opts c ctxt) pgf = do
     Left msg -> putStrLnE msg
     Right ty -> do lift $ modifyPGF pgf (createCategory c ctxt prob)
                    return ()
+transactionCommand (CreateConcrete opts name) pgf = do
+  lift $ modifyPGF pgf (createConcrete name (return ()))
+  return ()
 transactionCommand (CreateLin opts f t) pgf = do
   lang <- optLang pgf opts
   lift $ modifyPGF pgf (alterConcrete lang (createLin f []))
@@ -256,6 +259,9 @@ transactionCommand (DropFun opts f) pgf = do
 transactionCommand (DropCat opts c) pgf = do
   lift $ modifyPGF pgf (dropCategory c)
   return ()
+transactionCommand (DropConcrete opts name) pgf = do
+  lift $ modifyPGF pgf (dropConcrete name)
+  return ()
 transactionCommand (DropLin opts f) pgf = do
   lang <- optLang pgf opts
   lift $ modifyPGF pgf (alterConcrete lang (dropLin f))