diff --git a/python/ql/src/experimental/semmle/python/Concepts.qll b/python/ql/src/experimental/semmle/python/Concepts.qll
index 01d6707e6ce..ec9fa570b71 100644
--- a/python/ql/src/experimental/semmle/python/Concepts.qll
+++ b/python/ql/src/experimental/semmle/python/Concepts.qll
@@ -42,7 +42,7 @@ module SystemCommandExecution {
 /**
  * A data-flow node that decodes data from a binary or textual format. This
  * is intended to include deserialization, unmarshalling, decoding, unpickling,
- * unzipping, decrypting, parsing etc.
+ * decompressing, decrypting, parsing etc.
  *
  * Doing so should normally preserve taint, but it can also be a problem
  * in itself, e.g. if it allows code execution or could result in deinal-of-service.
diff --git a/python/ql/test/experimental/library-tests/frameworks/dill/Decoding.py b/python/ql/test/experimental/library-tests/frameworks/dill/Decoding.py
index 523f9a0a346..cff3a8292d4 100644
--- a/python/ql/test/experimental/library-tests/frameworks/dill/Decoding.py
+++ b/python/ql/test/experimental/library-tests/frameworks/dill/Decoding.py
@@ -1,4 +1,3 @@
 import dill
 
-dill.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=dill $decodeUnsafe=
-dill.loads(payload, encoding='latin1')  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=dill $decodeUnsafe=
+dill.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=dill $decodeUnsafe
diff --git a/python/ql/test/experimental/library-tests/frameworks/stdlib/Decoding.py b/python/ql/test/experimental/library-tests/frameworks/stdlib/Decoding.py
index 41bd019e6f0..8c25a253a99 100644
--- a/python/ql/test/experimental/library-tests/frameworks/stdlib/Decoding.py
+++ b/python/ql/test/experimental/library-tests/frameworks/stdlib/Decoding.py
@@ -10,6 +10,5 @@ app = Flask(__name__)
 @app.route("/")
 def hello():
     payload = request.args.get("payload")
-    pickle.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=pickle $decodeUnsafe=
-    pickle.loads(payload, encoding='latin1')  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=pickle $decodeUnsafe=
-    marshal.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=pickle $decodeUnsafe=
+    pickle.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=pickle $decodeUnsafe
+    marshal.loads(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=pickle $decodeUnsafe
diff --git a/python/ql/test/experimental/library-tests/frameworks/yaml/Decoding.py b/python/ql/test/experimental/library-tests/frameworks/yaml/Decoding.py
index 201e0e3c0a6..5503e53ac4a 100644
--- a/python/ql/test/experimental/library-tests/frameworks/yaml/Decoding.py
+++ b/python/ql/test/experimental/library-tests/frameworks/yaml/Decoding.py
@@ -10,5 +10,5 @@ app = Flask(__name__)
 @app.route("/")
 def hello():
     payload = request.args.get("payload")
-    yaml.load(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=YAML $decodeUnsafe=
+    yaml.load(payload)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=YAML $decodeUnsafe
     yaml.load(payload, Loader=SafeLoader)  # $decodeInput=payload $decodeOutput=Attribute() $decodeFormat=YAML