diff --git a/doc/mkdocs/docs/api/basic_json/back.md b/doc/mkdocs/docs/api/basic_json/back.md
index 4975f1531..1a715284d 100644
--- a/doc/mkdocs/docs/api/basic_json/back.md
+++ b/doc/mkdocs/docs/api/basic_json/back.md
@@ -33,6 +33,12 @@ If the JSON value is `#!json null`, exception
 
 Constant.
 
+## Notes
+
+!!! info "Precondition"
+
+    The array or object must not be empty. Calling `back` on an empty array or object yields undefined behavior.
+
 ## Examples
 
 ??? example
diff --git a/doc/mkdocs/docs/api/basic_json/front.md b/doc/mkdocs/docs/api/basic_json/front.md
index ce7460474..e258c36a0 100644
--- a/doc/mkdocs/docs/api/basic_json/front.md
+++ b/doc/mkdocs/docs/api/basic_json/front.md
@@ -26,6 +26,12 @@ If the JSON value is `#!json null`, exception
 
 Constant.
 
+## Notes
+
+!!! info "Precondition"
+
+    The array or object must not be empty. Calling `front` on an empty array or object yields undefined behavior.
+
 ## Examples
 
 ??? example
diff --git a/doc/mkdocs/docs/api/basic_json/object_comparator_t.md b/doc/mkdocs/docs/api/basic_json/object_comparator_t.md
index 44509a94b..e2bc79d05 100644
--- a/doc/mkdocs/docs/api/basic_json/object_comparator_t.md
+++ b/doc/mkdocs/docs/api/basic_json/object_comparator_t.md
@@ -8,7 +8,7 @@ using object_comparator_t = std::less<>;            // since C++14
 
 The comparator used in [`object_t`](object_t.md).
 
-When C++14 is detected, a transparent com parator is used which, when combined with perfect forwarding on find() and
+When C++14 is detected, a transparent comparator is used which, when combined with perfect forwarding on find() and
 count() calls, prevents unnecessary string construction.
 
 ## Version history
diff --git a/doc/mkdocs/docs/api/macros/json_no_io.md b/doc/mkdocs/docs/api/macros/json_no_io.md
index 52baefc66..10ae24c8a 100644
--- a/doc/mkdocs/docs/api/macros/json_no_io.md
+++ b/doc/mkdocs/docs/api/macros/json_no_io.md
@@ -5,7 +5,7 @@
 ```
 
 When defined, headers `<cstdio>`, `<ios>`, `<iosfwd>`, `<istream>`, and `<ostream>` are not included and parse functions
-relying on these headers are excluded. This is relevant for environment where these I/O functions are disallowed for
+relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for
 security reasons (e.g., Intel Software Guard Extensions (SGX)).
 
 ## Default definition
diff --git a/doc/mkdocs/docs/features/assertions.md b/doc/mkdocs/docs/features/assertions.md
index 0c13426a9..a0b118722 100644
--- a/doc/mkdocs/docs/features/assertions.md
+++ b/doc/mkdocs/docs/features/assertions.md
@@ -20,7 +20,7 @@ before including the `json.hpp` header.
 
 Function [`operator[]`](../api/basic_json/operator%5B%5D.md) implements unchecked access for objects. Whereas a missing
 key is added in case of non-const objects, accessing a const object with a missing key is undefined behavior (think of a
-dereferenced null pointer) and yields an runtime assertion.
+dereferenced null pointer) and yields a runtime assertion.
 
 If you are not sure whether an element in an object exists, use checked access with the
 [`at` function](../api/basic_json/at.md) or call the [`contains` function](../api/basic_json/contains.md) before.