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diff --git a/share/man/man7/sizeof.7 b/share/man/man7/sizeof.7
--- a/share/man/man7/sizeof.7
+++ b/share/man/man7/sizeof.7
@@ -34,35 +34,26 @@
.br
.Nm Vt expression
.Sh DESCRIPTION
-The
-.Nm
-operator yields the size of its operand.
-The
-.Nm
-operator cannot be applied to incomplete types and expressions
-with incomplete types (e.g.
-.Vt void ,
-or forward-defined
-.Vt struct foo ),
-and function types.
-.Pp
-The size of primitive (non-derived) data types in C may differ
-across hardware platforms and implementations.
-They are defined by corresponding Application Binary Interface (ABI)
-specifications, see
-.Xr arch 7
-for details about ABI used by
-.Fx .
-It may be necessary or useful for a program to be able
-to determine the storage size of a data type or object
-to account for the platform specifics.
-.Pp
The unary
.Nm
operator yields the storage size of an expression or
-data type in
-.Em char sized units
-(C language bytes).
+data type in bytes.
+.Sh DETAILS
+The size of data types in C (such as e.g., integers or
+pointers) may differ across hardware platforms and
+implementations.
+For example, systems on which integers, longs, and
+pointers are using 32 bits (e.g., i386) are referred
+to as using the "ILP32" data model, systems using
+64 bit longs and pointers (e.g., amd64 / x86_64)
+as the "LP64" data model.
+.Pp
+As it may be necessary or useful for a program to be able
+to determine the storage size of a data type or
+object,
+.Nm
+yields that size in
+.Em char sized units .
As a result,
.Ql sizeof(char)
is always guaranteed to be 1.
@@ -79,13 +70,6 @@
.In sys/param.h
header.)
.Sh EXAMPLES
-Different platforms may use different data models.
-For example, systems on which integers, longs, and
-pointers are using 32 bits (e.g., i386) are referred
-to as using the "ILP32" data model, systems using
-64 bit longs and pointers (e.g., amd64 / x86_64)
-as the "LP64" data model.
-.Pp
The following examples illustrate the possible results
of calling
.Nm
@@ -291,6 +275,11 @@
preprocessor, the
.Nm
operator cannot be used in a preprocessor expression.
+.Pp
+The
+.Nm
+operator cannot be used on a bit-field object, a
+function type, or an incomplete type.
.Sh SEE ALSO
.Xr arch 7 ,
.Xr operator 7

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