diff --git a/doc/writing-python-agents.md b/doc/writing-python-agents.md
index aeb4acbd6..584b1c997 100644
--- a/doc/writing-python-agents.md
+++ b/doc/writing-python-agents.md
@@ -1,90 +1,93 @@
 # Resource Agent guide for Python
 
 ## Introduction
 
 A simple library for authoring resource agents in Python is
 provided in the `ocf.py` library.
 
 Agents written in Python should be ideally compatible both with Python
 2.7+ and Python 3.3+.
 
 The library provides various helper constants and functions, a logging
 implementation as well as a run loop and metadata generation facility.
 
 ## Constants
 
 The following OCF constants are provided:
 
 * `OCF_SUCCESS`
 * `OCF_ERR_GENERIC`
 * `OCF_ERR_ARGS`
 * `OCF_ERR_UNIMPLEMENTED`
 * `OCF_ERR_PERM`
 * `OCF_ERR_INSTALLED`
 * `OCF_ERR_CONFIGURED`
 * `OCF_NOT_RUNNING`
 * `OCF_RUNNING_MASTER`
 * `OCF_FAILED_MASTER`
 * `OCF_RESOURCE_INSTANCE`
 * `HA_DEBUG`
 * `HA_DATEFMT`
 * `HA_LOGFACILITY`
 * `HA_LOGFILE`
 * `HA_DEBUGLOG`
 * `OCF_ACTION` -- Set to `$__OCF_ACTION` if set, or to the first command line argument.
 
 ## Logger
 
 The `logger` variable holds a Python standard log object with its
 formatter set to follow the OCF standard logging format.
 
 Example:
 
 ``` python
 
 from ocf import logger
 
 logger.error("Something went terribly wrong.")
 
 ```
 
 ## Helper functions
 
 * `ocf_exit_reason`: Prints the exit error string to stderr.
 * `have_binary`: Returns True if the given binary is available.
 * `is_true`: Converts an OCF truth value to a Python boolean.
 * `get_parameter`: Looks up the matching `OCF_RESKEY_` environment variable.
 * `Metadata`: Class which helps to generate the XML metadata.
 * `run`: OCF run loop implementation.
 
 ## Run loop and metadata example
 
 ``` python
+import os
+import sys
+
 OCF_FUNCTIONS_DIR="%s/lib/heartbeat" % os.environ.get("OCF_ROOT")
 sys.path.append(OCF_FUNCTIONS_DIR)
 import ocf
 
 def start_action(argument):
     print("The start action receives the argument as a parameter: {}".format(argument))
 
 
 def main():
     metadata = ocf.Metadata("example-agent",
                             shortdesc="This is an example agent",
                             longdesc="An example of how to " +
                             "write an agent in Python using the ocf " +
                             "Python library.")
     metadata.add_parameter("argument",
                            shortdesc="Example argument",
                            longdesc="This argument is just an example.",
                            content_type="string",
                            default="foobar")
     metadata.add_action("start", timeout=60)
     ocf.run(metadata,
             handlers={
                 "start": start_action
             })
 
 if __name__ == "__main__":
     main()
 ```