diff --git a/glaze.changes b/glaze.changes
index 6a9da03..c72840c 100644
--- a/glaze.changes
+++ b/glaze.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Jan 28 13:21:04 UTC 2025 - Jan Engelhardt <jengelh@inai.de>
+
+- Quantify speed claims
+
 -------------------------------------------------------------------
 Mon Jan 27 18:01:41 UTC 2025 - Florian "spirit" <sp1rit@disroot.org>
 
diff --git a/glaze.spec b/glaze.spec
index a251912..8eeb851 100644
--- a/glaze.spec
+++ b/glaze.spec
@@ -21,10 +21,10 @@
 Name:           glaze
 Version:        4.3.1
 Release:        0
-Summary:        Extremely fast, in memory, JSON and interface library for modern C++
+Summary:        JSON library for modern C++
 License:        MIT
 Group:          Development/Libraries/C and C++
-URL:            https://github.com/stephenberry/%{name}
+URL:            https://github.com/stephenberry/glaze
 Source0:        https://github.com/stephenberry/%{name}/archive/refs/tags/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 BuildRequires:  cmake
 BuildRequires:  gcc-c++ >= 12
@@ -34,14 +34,19 @@ Summary:        Development files for %{name}
 Group:          Development/Libraries/C and C++
 BuildArch:      noarch
 
-%define _description %{expand:
-One of the fastest JSON libraries in the world. Glaze reads and
-writes from object memory, simplifying interfaces and offering
-incredible performance.}
+%description
+Glaze is a JSON library that reads/writes from/to object memory.
+It also supports BEVE and CSV.
 
-%description %{_description}
+%description devel
+Glaze is a JSON library that reads/writes from/to object memory. It
+supports BEVE and CSV as well.
 
-%description devel %{_description}
+Glaze utilizes SIMD (SSE/AVX/NEON) and deals well with
+out-of-sequence data and missing keys. Based on an August 2024
+measurement on an Apple M1 CPU, it was measured at 1224/1366 MB/s,
+outperforming other implementations like yyjson-0.10.0 by 10/35%% and
+rapidjson-1.1.0 by 172/371%% (read/write speeds, respectively).
 
 This subpackage contains development files for %{name}.