add monkey patching to ruby API docs (#1406)

1 files changed, 33 insertions, 2 deletions

diff --git a/docs/Ruby-API.md b/docs/Ruby-API.md
index a9963b3..f3f488a 100644
--- a/docs/Ruby-API.md
+++ b/docs/Ruby-API.md
@@ -43,6 +43,8 @@ it at least once is required for a model to work.
 The block may contain commands to change some behaviour for the given methods
 (e.g. calling `post_login` to disable the pager).
 
+Supports [monkey patching](#monkey-patching).
+
 #### `cmd`
 
 Is used to specify commands that should be executed on a model in order to
@@ -75,6 +77,8 @@ string.
 Execution order is `:all`, `:secret`, and lastly the command specific block, if
 given.
 
+Supports [monkey patching](#monkey-patching).
+
 #### `comment`
 
 Called with a single string containing the string to prepend for comments in
@@ -99,6 +103,8 @@ The passed data is replaced by the return value of the block.
 `expect` can be used to, for example, strip escape sequences from output before
 it's further processed.
 
+Supports [monkey patching](#monkey-patching).
+
 ### At the second level
 
 The following methods are available:
@@ -119,7 +125,11 @@ Used inside `cfg` invocations to specify commands to run once Oxidized has
 logged in to the device. Takes one argument that is either a block (taking zero
 parameters) or a string containing a command to execute.
 
-This allows `post_login` to be used for any model-specific items prior to running the regular commands. This could include disabling the output pager or timestamp outputs that would cause constant differences.
+This allows `post_login` to be used for any model-specific items prior to
+running the regular commands. This could include disabling the output pager
+or timestamp outputs that would cause constant differences.
+
+Supports [monkey patching](#monkey-patching).
 
 #### `pre_logout`
 
@@ -127,9 +137,30 @@ Used to specify commands to run before Oxidized closes the connection to the
 device. Takes one argument that is either a block (taking zero parameters) or a
 string containing a command to execute.
 
-This allows `pre_logout` to be used to 'undo' any changes that may have been needed via `post_login` (restore pager output, etc.)
+This allows `pre_logout` to be used to 'undo' any changes that may have been
+needed via `post_login` (restore pager output, etc.)
+
+Supports [monkey patching](#monkey-patching).
 
 #### `send`
 
 Usually used inside `expect` or blocks passed to `post_login`/`pre_logout`.
 Takes a single parameter: a string to be sent to the device.
+
+### Monkey patching
+
+Several model blocks accept behavior-modifying arguments that make monkey
+patching existing blocks easier. This is primarily useful when a user-supplied
+model aims to override or extend existing behavior of a model included in Oxidized.
+
+This functionality is supported by `cfg`, `cmd`, `pre_*`, `post_*`, and `expect`
+blocks.
+
+#### `clear: true`
+
+Resets the existing block, allowing the user to completely override its contents.
+
+#### `prepend: true`
+
+Ensures that the contents of the block are prepended, rather than appended (the
+default) to an existing block.