Updated readme

README.md

@@ -1,11 +1,39 @@
 ComfyUI - String Utils
 =============================================================================
 
-Collection of custom nodes for ComfyUI that make working with text
-easier, such as concatenating strings or composing new ones from
-parts.
+Collection of custom nodes for ComfyUI dedicated to the analysis and
+transformation of text strings, such as for formatting and conversions
+between types.
 
 Nodes
 -----------------------------------------------------------------------------
 
-TODO
+### Text Formatter
+
+Several nodes with varying numbers of optional inputs that can be used
+in conjunction with a formatting string to create the output. The node
+uses standard [python string formatting][1].
+
+**Example**
+```text
+Input:
+- arg0: "John"
+- arg1: 42
+
+Format:
+"Hello, {arg0}! Did you know? {arg1} is the answer to everything."
+
+Output:
+"Hello, John! Did you know? 42 is the answer to everything."
+```
+
+The nodes are useful to compose prompts based on variable inputs and
+can be combined with [dynamic prompts][2] for even more flexibility.
+
+### ATOI/ITOA
+
+Two simple nodes to convert strings to integers and vice versa.
+
+
+[1]: https://docs.python.org/3/tutorial/inputoutput.html
+[2]: https://github.com/exectails/comfyui-et_dynamicprompts