diff --git a/pythonetc/README.md b/pythonetc/README.md
index a54301c..ab6555f 100644
--- a/pythonetc/README.md
+++ b/pythonetc/README.md
@@ -14,8 +14,6 @@ You don't need telegram to read the channel using the link above. If neither of
 
 ## To schedule
 
-1. ./dedent.md
-1. ./immutable.md
 1. ./sqlite3.md
 1. ./str-chain.md
 1. ./json-allow-nan.md
@@ -51,3 +49,4 @@ These are ideas for future posts. Let me know if you want to write a guest post
 + trace
 + atexit
 + Lazy annotations hype
++ del
diff --git a/pythonetc/dedent.md b/pythonetc/dedent.md
index 4c442ef..b33e645 100644
--- a/pythonetc/dedent.md
+++ b/pythonetc/dedent.md
@@ -1,4 +1,8 @@
-Multiline string literal preserves every symbol between openning and closing quotes, including identation:
+# textwrap.dedent
+
+Published: 27 April 2021, 18:00
+
+Multiline string literal preserves every symbol between opening and closing quotes, including indentation:
 
 ```python
 def f():
@@ -22,7 +26,7 @@ f()
 # '\nhello\n  world\n'
 ```
 
-However, it's difficult to read because it looks like the literal is outside of the function body but it's not. So, a much better solution is not to break the identation but instead remove it from the string content using [textwrap.dedent](https://docs.python.org/3/library/textwrap.html#textwrap.dedent):
+However, it's difficult to read because it looks like the literal is outside of the function body but it's not. So, a much better solution is not to break the indentation but instead remove it from the string content using [textwrap.dedent](https://docs.python.org/3/library/textwrap.html#textwrap.dedent):
 
 ```python
 from textwrap import dedent
diff --git a/pythonetc/immutable.md b/pythonetc/immutable.md
index b05b45a..b6af507 100644
--- a/pythonetc/immutable.md
+++ b/pythonetc/immutable.md
@@ -1,3 +1,7 @@
+# types.MappingProxyType
+
+Published: 29 April 2021, 18:00
+
 If any function can modify any passed argument, how to prevent a value from modification? Make it immutable! That means the object doesn't have methods to modify it in place, only methods returning a new value. This is how numbers and `str` are immutable. While `list` has `append` method that modifies the object in place, `str` just doesn't have anything like this, all modifications return a new `str`:
 
 ```python