diff --git a/change-notes/2020-11-03-underscore-assigns.md b/change-notes/2020-11-03-underscore-assigns.md
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index 00000000000..d8f7accfeda
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+++ b/change-notes/2020-11-03-underscore-assigns.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Fixed a bug that meant partially-ignored parallel assignments, such as `x, _ := a, b`, could produce an incorrect control-flow graph.
diff --git a/change-notes/2020-11-19-dataflow-edges.md b/change-notes/2020-11-19-dataflow-edges.md
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index 00000000000..827b33ce436
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+++ b/change-notes/2020-11-19-dataflow-edges.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Fixed a bug that meant data-flow through a checked typecast (e.g. `cast, ok = x.(*Type)`) could be missed.
diff --git a/change-notes/2020-11-27-guarding-functions.md b/change-notes/2020-11-27-guarding-functions.md
new file mode 100644
index 00000000000..5a51d59ef43
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+++ b/change-notes/2020-11-27-guarding-functions.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Improved ability to recognise a sanitizing function (for example, `func f(s string) bool { return isClean(s) }`). This may reduce false-positives for any query employing a sanitizing test.
diff --git a/change-notes/2020-12-01-fmt-errorf.md b/change-notes/2020-12-01-fmt-errorf.md
new file mode 100644
index 00000000000..e90c5967631
--- /dev/null
+++ b/change-notes/2020-12-01-fmt-errorf.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Recognised function `fmt.Errorf` to always return non-nil strings. This may reduce false-positives that depend on a function possibly returning nil.
diff --git a/change-notes/2020-12-23-regexp-anchors.md b/change-notes/2020-12-23-regexp-anchors.md
new file mode 100644
index 00000000000..4574cf1c10f
--- /dev/null
+++ b/change-notes/2020-12-23-regexp-anchors.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Query `go/regex/missing-regexp-anchor` now recognizes the start- and end-of-text anchors `\A` and `\z`. This reduces false-positives relating to unanchored expressions.