diff --git a/cfbs.json b/cfbs.json
index e2641c0..e05a954 100644
--- a/cfbs.json
+++ b/cfbs.json
@@ -154,7 +154,9 @@
       "subdirectory": "libraries/python",
       "steps": [
         "copy cfengine_module_library.py modules/promises/cfengine_module_library.py",
-        "copy cfengine_module_library.py modules/promises/cfengine.py"
+        "replace_version 2 0.0.0 modules/promises/cfengine_module_library.py",
+        "copy cfengine_module_library.py modules/promises/cfengine.py",
+        "replace_version 2 0.0.0 modules/promises/cfengine.py"
       ]
     },
     "maintainers-in-motd": {
diff --git a/libraries/python/cfengine_module_library.py b/libraries/python/cfengine_module_library.py
index 7e07e0f..3e8ddb4 100644
--- a/libraries/python/cfengine_module_library.py
+++ b/libraries/python/cfengine_module_library.py
@@ -5,6 +5,15 @@
 Currently, this is for implementing custom promise types,
 but it might be expanded to other types of modules in the future,
 for example custom functions.
+
+This library is available as a module in CFEngine Build:
+
+https://build.cfengine.com/modules/library-for-promise-types-in-python/
+
+CFEngine Build version: 0.0.0
+
+(If the version number is all zeroes, you are looking at the source. It will
+be replaced in a build step when you run cfbs build).
 """
 
 import sys
@@ -119,7 +128,7 @@ class Result:
 
 class PromiseModule:
     def __init__(
-        self, name="default_module_name", version="0.0.1", record_file_path=None
+        self, name="default_module_name", version="0.0.0", record_file_path=None
     ):
         self.name = name
         self.version = version