diff --git a/libraries.api.php b/libraries.api.php
index 9606185..9a51ede 100644
--- a/libraries.api.php
+++ b/libraries.api.php
@@ -33,16 +33,17 @@
  *     determined programmatically. Either 'version' or 'version callback' (or
  *     'version arguments' in case libraries_get_version() is being used as a
  *     version callback) must be declared.
- *   - version callback: (optional) The name of a function that detects and
- *     returns the full version string of the library. The first argument is
- *     always $library, an array containing all library information as described
- *     here. There are two ways to declare the version callback's additional
- *     arguments, either as a single $options parameter or as multiple
- *     parameters, which correspond to the two ways to specify the argument
- *     values (see 'version arguments'). Defaults to libraries_get_version().
- *     Unless 'version' is declared or libraries_get_version() is being used as
- *     a version callback, 'version callback' must be declared. In the latter
- *     case, however, 'version arguments' must be declared in the specified way.
+ *   - version callback: (optional) The name of a function or an anonymous
+ *     function that detects and returns the full version string of the library.
+ *     The first argument is always $library, an array containing all library
+ *     information as described here. There are two ways to declare the version
+ *     callback's additional arguments, either as a single $options parameter
+ *     or as multiple parameters, which correspond to the two ways to specify
+ *     the argument values (see 'version arguments'). Defaults to
+ *     libraries_get_version(). Unless 'version' is declared or
+ *     libraries_get_version() is being used as a version callback,
+ *     'version callback' must be declared. In the latter case, however,
+ *     'version arguments' must be declared in the specified way.
  *   - version arguments: (optional) A list of arguments to pass to the version
  *     callback. Version arguments can be declared either as an associative
  *     array whose keys are the argument names or as an indexed array without