diff --git a/pythonetc/3.9/decorators.md b/pythonetc/3.9/decorators.md
index 8d1daff..41defd8 100644
--- a/pythonetc/3.9/decorators.md
+++ b/pythonetc/3.9/decorators.md
@@ -24,7 +24,7 @@ f
#
```
-You can use matrix multiplication to make it really confusing (don't try it at home!):
+You can use matrix multiplication to make it confusing (don't try it at home!):
```python
class D:
diff --git a/pythonetc/3.9/str-removeprefix.md b/pythonetc/3.9/str-removeprefix.md
index 5ea92d7..6ff86c9 100644
--- a/pythonetc/3.9/str-removeprefix.md
+++ b/pythonetc/3.9/str-removeprefix.md
@@ -1,4 +1,4 @@
-In python 3.6, [PEP-616](https://www.python.org/dev/peps/pep-0616/) introduced `str.removeprefix` and `str.removesuffix` methods:
+In python 3.9, [PEP-616](https://www.python.org/dev/peps/pep-0616/) introduced `str.removeprefix` and `str.removesuffix` methods:
```python
'abcd'.removeprefix('ab')
diff --git a/pythonetc/3.9/unparse.md b/pythonetc/3.9/unparse.md
index fadb155..3cf4d0e 100644
--- a/pythonetc/3.9/unparse.md
+++ b/pythonetc/3.9/unparse.md
@@ -7,4 +7,4 @@ ast.unparse(tree)
# '\na = 1 + 2 + 3'
```
-It knows nothing about the initial formatting and comments. So, it's not a code formatter but a tool to simplify analyzing AST. Also, it can be used for code generation.
+It knows nothing about the initial formatting and comments. So, it's not a code formatter but a tool to simplify visual AST analysis. Also, it can be used for code generation.
diff --git a/pythonetc/README.md b/pythonetc/README.md
index f0979d0..99e6b04 100644
--- a/pythonetc/README.md
+++ b/pythonetc/README.md
@@ -1,16 +1,16 @@
## Plan
-1. ./intro.md
+1. ./intro.md (26 May 2020, 18:00)
A bit of history and 3.9:
-1. ./3.9/str-removeprefix.md
-1. ./hist/backquotes.md
-1. ./3.9/merge-dicts.md
-1. ./3.9/generic-types.md
-1. ./hist/types.md
-1. ./3.9/unparse.md
-1. ./3.9/decorators.md
+1. ./3.9/str-removeprefix.md (28 May 2020, 18:00)
+1. ./hist/backquotes.md (2 June 2020, 18:00)
+1. ./3.9/merge-dicts.md (4 June 2020, 18:00)
+1. ./3.9/generic-types.md (9 June 2020, 18:00)
+1. ./hist/types.md (11 June 2020, 18:00)
+1. ./3.9/unparse.md (16 June 2020, 18:00)
+1. ./3.9/decorators.md (18 June 2020, 18:00)
Frames:
diff --git a/pythonetc/hist/types.md b/pythonetc/hist/types.md
index ea6778a..24c57c1 100644
--- a/pythonetc/hist/types.md
+++ b/pythonetc/hist/types.md
@@ -7,6 +7,7 @@ isinstance(1, int)
import types
isinstance(1, types.IntType)
+# True
# Python 2.4 and later:
isinstance(1, int)