diff --git a/slic3r.spec b/slic3r.spec
index 813dd60..e0db401 100644
--- a/slic3r.spec
+++ b/slic3r.spec
@@ -25,10 +25,11 @@ Patch6:         %{name}-wayland.patch
 Patch7:         %{name}-boost169.patch
 
 # Use GCC predefined macros instead of deprecated Boost header
+# Upstream already dropped this code in PR#781
 Patch8:         %{name}-endian.patch
-# Make boost::Placeholders::_1 visible
+# Make boost::Placeholders::_1 visible (PR#4976)
 Patch9:         %{name}-bind-placeholders.patch
-# Use boost/nowide/cstdlib.hpp instead of boost/nowide/cenv.hpp
+# Use boost/nowide/cstdlib.hpp instead of boost/nowide/cenv.hpp (PR#4976)
 Patch10:         %{name}-boost-nowide.patch
 
 Source1:        %{name}.desktop