diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7d11c62a..1cd8f8e4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3272,6 +3272,28 @@ This release closes the following issue:
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+
+#### [@stdlib/math/base/special/havercos](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/havercos)
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+
+
+
+##### Features
+
+- [`d0f9748`](https://github.com/stdlib-js/stdlib/commit/d0f97483ab6edaf668b7693dd7b96d527823f14b) - add C implementation for `math/base/special/havercos` [(##2410)](#2410 )
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#### [@stdlib/math/base/special/kernel-cos](https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/kernel-cos)
@@ -4767,6 +4789,7 @@ A total of 29 people contributed to this release. Thank you to the following con
+- [`d0f9748`](https://github.com/stdlib-js/stdlib/commit/d0f97483ab6edaf668b7693dd7b96d527823f14b) - **feat:** add C implementation for `math/base/special/havercos` [(##2410)](#2410 ) _(by Gunj Joshi)_
- [`cb7d879`](https://github.com/stdlib-js/stdlib/commit/cb7d8790c02f7ce9df7d5c22e662d74ad9b95cd9) - **feat:** add C implementation for `math/base/special/tand` [(##2411)](#2411 ) _(by Gunj Joshi)_
- [`7ddca8e`](https://github.com/stdlib-js/stdlib/commit/7ddca8e7270b9d325d8047524a62381fb56dfc5e) - **feat:** add C implementation for `math/base/special/erfinv` _(by Pranav Goswami, Philipp Burckhardt)_
- [`4a0235a`](https://github.com/stdlib-js/stdlib/commit/4a0235a063e46d679253b6511fe7e9dbd4a9d625) - **feat:** add C implementation for `math/base/special/pow` _(by Aman Bhansali, Athan, Philipp Burckhardt)_
diff --git a/base/special/havercos/README.md b/base/special/havercos/README.md
index c4c669e95..e5415d716 100644
--- a/base/special/havercos/README.md
+++ b/base/special/havercos/README.md
@@ -93,6 +93,94 @@ for ( i = 0; i < x.length; i++ ) {
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+* * *
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+
+
+## C APIs
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+### Usage
+
+```c
+#include "stdlib/math/base/special/havercos.h"
+```
+
+#### stdlib_base_havercos( x )
+
+Computes the half-value [versed cosine][versed-cosine] (in radians).
+
+```c
+double out = stdlib_base_havercos( 0.0 );
+// returns 1.0
+
+out = stdlib_base_havercos( 3.141592653589793 / 2.0 );
+// returns 0.5
+```
+
+The function accepts the following arguments:
+
+- **x**: `[in] double` input value.
+
+```c
+double stdlib_base_havercos( const double x );
+```
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+
+
+### Examples
+
+```c
+#include "stdlib/math/base/special/havercos.h"
+#include
+
+int main( void ) {
+ const double x[] = { 0.0, 0.523, 0.785, 1.047, 3.14 };
+
+ double y;
+ int i;
+ for ( i = 0; i < 5; i++ ) {
+ y = stdlib_base_havercos( x[ i ] );
+ printf( "havercos(%lf) = %lf\n", x[ i ], y );
+ }
+}
+```
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