chore: changelog and docs for #1623

CHANGELOG.md

@@ -8,6 +8,8 @@
   (#1415, #1547 by @pd93).
 - Refactored how Task reads, parses and merges Taskfiles using a DAG (#1563,
   #1607 by @pd93).
+- Fix a bug which stopped tasks from using `stdin` as input (#1593, #1623 by
+  @pd03).
 - Fix error when a file or directory in the project contained a special char
   like `&`, `(` or `)` (#1551, #1584 by @andreynering).
 - Added alias `q` for template function `shellQuote` (#1601, #1603 by @vergenzt)

website/docs/usage.mdx

@@ -121,13 +121,14 @@ tasks:
 ### Reading a Taskfile from stdin
 
 Taskfile also supports reading from stdin. This is useful if you are generating
-Taskfiles dynamically and don't want write them to disk. This works just like
-any other program that supports stdin. For example:
+Taskfiles dynamically and don't want write them to disk. To tell task to read
+from stdin, you must specify the `-t/--taskfile` flag with the special `-`
+value. You may then pipe into Task as you would any other program:
 
 ```shell
-task < <(cat ./Taskfile.yml)
+task -t - <(cat ./Taskfile.yml)
 # OR
-cat ./Taskfile.yml | task
+cat ./Taskfile.yml | task -t -
 ```
 
 ## Environment variables