diff --git a/docs/BUILD b/docs/BUILD
index 752ae61..6fa677e 100644
--- a/docs/BUILD
+++ b/docs/BUILD
@@ -99,13 +99,6 @@ stardoc(
     deps = ["//rules:copy_file"],
 )
 
-stardoc(
-    name = "maprule_docs",
-    out = "maprule_doc_gen.md",
-    input = "//rules:maprule.bzl",
-    deps = ["//rules:maprule"],
-)
-
 stardoc(
     name = "write_file_docs",
     out = "write_file_doc_gen.md",
diff --git a/rules/BUILD b/rules/BUILD
index 2f26c89..0d7d150 100644
--- a/rules/BUILD
+++ b/rules/BUILD
@@ -13,47 +13,13 @@ bzl_library(
 bzl_library(
     name = "copy_file",
     srcs = ["copy_file.bzl"],
-    deps = [":copy_file_private"],
-)
-
-bzl_library(
-    name = "copy_file_private",
-    srcs = ["copy_file_private.bzl"],
-    visibility = ["//visibility:private"],
-)
-
-bzl_library(
-    name = "maprule",
-    srcs = ["maprule.bzl"],
-    deps = [":maprule_private"],
-)
-
-bzl_library(
-    name = "maprule_private",
-    srcs = ["maprule_private.bzl"],
-    visibility = ["//visibility:private"],
-    deps = [
-        ":maprule_util",
-        "//lib:dicts",
-        "//lib:paths",
-    ],
-)
-
-bzl_library(
-    name = "maprule_util",
-    srcs = ["maprule_util.bzl"],
+    deps = ["//rules/private:copy_file_private"],
 )
 
 bzl_library(
     name = "write_file",
     srcs = ["write_file.bzl"],
-    deps = [":write_file_private"],
-)
-
-bzl_library(
-    name = "write_file_private",
-    srcs = ["write_file_private.bzl"],
-    visibility = ["//visibility:private"],
+    deps = ["//rules/private:write_file_private"],
 )
 
 # Exported for build_test.bzl to make sure of, it is an implementation detail
diff --git a/rules/copy_file.bzl b/rules/copy_file.bzl
index e985b3f..c3bc5e6 100644
--- a/rules/copy_file.bzl
+++ b/rules/copy_file.bzl
@@ -22,7 +22,7 @@ on Windows (no Bash is required).
 """
 
 load(
-    ":copy_file_private.bzl",
+    "//rules/private:copy_file_private.bzl",
     _copy_file = "copy_file",
 )
 
diff --git a/rules/private/BUILD b/rules/private/BUILD
new file mode 100644
index 0000000..df4dced
--- /dev/null
+++ b/rules/private/BUILD
@@ -0,0 +1,35 @@
+load("//:bzl_library.bzl", "bzl_library")
+
+bzl_library(
+    name = "copy_file_private",
+    srcs = ["copy_file_private.bzl"],
+    visibility = ["//rules:__pkg__"],
+)
+
+bzl_library(
+    name = "write_file_private",
+    srcs = ["write_file_private.bzl"],
+    visibility = ["//rules:__pkg__"],
+)
+
+bzl_library(
+    name = "maprule",
+    srcs = ["maprule.bzl"],
+    visibility = ["//tests:__pkg__"],
+    deps = [":maprule_private"],
+)
+
+bzl_library(
+    name = "maprule_private",
+    srcs = ["maprule_private.bzl"],
+    deps = [
+        ":maprule_util",
+        "//lib:dicts",
+        "//lib:paths",
+    ],
+)
+
+bzl_library(
+    name = "maprule_util",
+    srcs = ["maprule_util.bzl"],
+)
diff --git a/rules/copy_file_private.bzl b/rules/private/copy_file_private.bzl
similarity index 100%
rename from rules/copy_file_private.bzl
rename to rules/private/copy_file_private.bzl
diff --git a/rules/maprule.bzl b/rules/private/maprule.bzl
similarity index 100%
rename from rules/maprule.bzl
rename to rules/private/maprule.bzl
diff --git a/rules/maprule_private.bzl b/rules/private/maprule_private.bzl
similarity index 100%
rename from rules/maprule_private.bzl
rename to rules/private/maprule_private.bzl
diff --git a/rules/maprule_testing.bzl b/rules/private/maprule_testing.bzl
similarity index 100%
rename from rules/maprule_testing.bzl
rename to rules/private/maprule_testing.bzl
diff --git a/rules/maprule_util.bzl b/rules/private/maprule_util.bzl
similarity index 100%
rename from rules/maprule_util.bzl
rename to rules/private/maprule_util.bzl
diff --git a/rules/write_file_private.bzl b/rules/private/write_file_private.bzl
similarity index 100%
rename from rules/write_file_private.bzl
rename to rules/private/write_file_private.bzl
diff --git a/rules/write_file.bzl b/rules/write_file.bzl
index 5f09b33..908bbc6 100644
--- a/rules/write_file.bzl
+++ b/rules/write_file.bzl
@@ -23,7 +23,7 @@ file. Instead they use Starlark's built-in file writing action
 """
 
 load(
-    ":write_file_private.bzl",
+    "//rules/private:write_file_private.bzl",
     _write_file = "write_file",
 )
 
diff --git a/tests/maprule/BUILD b/tests/maprule/BUILD
index d33039e..390b96d 100644
--- a/tests/maprule/BUILD
+++ b/tests/maprule/BUILD
@@ -1,6 +1,9 @@
 # This package aids testing the 'maprule' rule.
+#
+# ATTENTION: As of 2019-03-20, maprule is not ready for public use.
+# @laszlocsomor is planning incompatible changes to the rule.
 
-load("//rules:maprule.bzl", "bash_maprule")
+load("//rules/private:maprule.bzl", "bash_maprule")
 
 package(default_testonly = 1)
 
diff --git a/tests/maprule_tests.bzl b/tests/maprule_tests.bzl
index ddb4418..0b63fbd 100644
--- a/tests/maprule_tests.bzl
+++ b/tests/maprule_tests.bzl
@@ -15,7 +15,7 @@
 """Unit tests for maprule.bzl."""
 
 load("//lib:unittest.bzl", "asserts", "unittest")
-load("//rules:maprule_testing.bzl", "maprule_testing")
+load("//rules/private:maprule_testing.bzl", "maprule_testing")
 
 def _dummy_generating_action(ctx, path):
     ctx.actions.write(path, "hello")