diff --git a/update.py b/update.py
index 84b4982..0bad7af 100644
--- a/update.py
+++ b/update.py
@@ -224,6 +224,21 @@ def gen_cmakelists(project_name, minimum_cmake_version, relative_path, modules):
 # ------------------------------------------------------------------------------
 
 
+def prepend_or_set(config, section, option, value):
+    """
+    If option is already set, then value is prepended.
+    If option is not set, then it is created and set to value.
+    This is used to prepend options with values which come from the module documentation.
+    """
+    if value:
+        if config.has_option(section, option):
+            value += '\n%s' % config.get(section, option)
+        config.set(section, option, value)
+    return config
+
+# ------------------------------------------------------------------------------
+
+
 def fetch_modules(config, relative_path):
     """
     Assemble modules which will
@@ -272,14 +287,10 @@ def fetch_modules(config, relative_path):
                     if parse_doc:
                         with open(file_name, 'r') as f:
                             config_docopt, config_define, config_export, config_fetch = parse_cmake_module(f.read())
-                            if config_docopt:
-                                config.set(section, 'docopt', config_docopt)
-                            if config_define:
-                                config.set(section, 'define', config_define)
-                            if config_export:
-                                config.set(section, 'export', config_export)
-                            if config_fetch:
-                                config.set(section, 'fetch', config_fetch)
+                            config = prepend_or_set(config, section, 'docopt', config_docopt)
+                            config = prepend_or_set(config, section, 'define', config_define)
+                            config = prepend_or_set(config, section, 'export', config_export)
+                            config = prepend_or_set(config, section, 'fetch', config_fetch)
                     modules.append(Module(path=path, name=name))
                 i += 1
                 print_progress_bar(