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diff --git a/share/man/man3/Makefile b/share/man/man3/Makefile
--- a/share/man/man3/Makefile
+++ b/share/man/man3/Makefile
@@ -72,6 +72,7 @@
arb.3 ARB_RIGHT.3 \
arb.3 ARB_RIGHTIDX.3 \
arb.3 ARB_ROOT.3
+MLINKS+= assert.3 static_assert.3
MLINKS+= ATOMIC_VAR_INIT.3 atomic_compare_exchange_strong.3 \
ATOMIC_VAR_INIT.3 atomic_compare_exchange_strong_explicit.3 \
ATOMIC_VAR_INIT.3 atomic_compare_exchange_weak.3 \
diff --git a/share/man/man3/assert.3 b/share/man/man3/assert.3
--- a/share/man/man3/assert.3
+++ b/share/man/man3/assert.3
@@ -28,15 +28,18 @@
.\" @(#)assert.3 8.1 (Berkeley) 6/9/93
.\" $FreeBSD$
.\"
-.Dd May 31, 2018
+.Dd April 20, 2021
.Dt ASSERT 3
.Os
.Sh NAME
-.Nm assert
+.Nm assert ,
+.Nm static_assert
.Nd expression verification macro
.Sh SYNOPSIS
.In assert.h
.Fn assert expression
+.Fn static_assert expression
+.Fn static_assert expression message
.Sh DESCRIPTION
The
.Fn assert
@@ -81,6 +84,21 @@
macro should only be used for ensuring the developer's expectations
hold true.
It is not appropriate for regular run-time error detection.
+.Pp
+The
+.Fn static_assert
+macro expands to
+.Fn _Static_assert ,
+and, contrarily to
+.Fn assert ,
+makes assertions at compile-time.
+Once the constraint is violated, the compiler produces a diagnostic
+message including the string literal message, if provided.
+The initial form of the
+.Fn _Static_assert
+containing a string literal message was introduced in C11 standard, and
+the other form with no string literal is to be implemented by C2x and
+some compilers may lack its adoption at present.
.Sh EXAMPLES
The assertion:
.Dl "assert(1 == 0);"
@@ -95,14 +113,29 @@
Second, the code will disappear if
.Dv NDEBUG
is defined, changing the semantics of the program.
+.Pp
+The following asserts that the size of the S structure is 16.
+Otherwise, it produces a diagnostic message which points at the
+constraint and includes the provided string literal:
+.Dl "static_assert(sizeof(struct S) == 16, ""size mismatch"");"
+If none is provided, it only points at the constraint.
.Sh SEE ALSO
.Xr abort2 2 ,
.Xr abort 3
.Sh STANDARDS
+.Rs
The
.Fn assert
macro conforms to
.St -isoC-99 .
+.Re
+.Pp
+.Rs
+The
+.Fn static_assert
+macro conforms to
+.St -isoC-2011 .
+.Re
.Sh HISTORY
An
.Nm

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