diff --git a/cfg/std.cfg b/cfg/std.cfg
index cbd6bd72f..ad79e3042 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -1,8 +1,10 @@
 <?xml version="1.0"?>
 <def format="1">
+  <!-- void abort(void); -->
   <function name="abort">
     <noreturn>true</noreturn>
   </function>
+  <!-- int abs (int j); -->
   <function name="abs">
     <use-retval/>
     <pure/>
@@ -13,6 +15,7 @@
       <not-bool/>
     </arg>
   </function>
+  <!-- double acos(double x); -->
   <function name="acos">
     <use-retval/>
     <pure/>
@@ -22,6 +25,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- float acosf(float x); -->
   <function name="acosf">
     <use-retval/>
     <pure/>
@@ -31,6 +35,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- long double acosl(long double x); -->
   <function name="acosl">
     <use-retval/>
     <pure/>
@@ -40,6 +45,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- double acosh(double x); -->
   <function name="acosh">
     <use-retval/>
     <pure/>
@@ -49,6 +55,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- float acoshf(float x); -->
   <function name="acoshf">
     <use-retval/>
     <pure/>
@@ -58,6 +65,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- long double acoshl(long double x); -->
   <function name="acoshl">
     <use-retval/>
     <pure/>
@@ -160,6 +168,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- double asin(double x); -->
   <function name="asin">
     <use-retval/>
     <pure/>
@@ -169,6 +178,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- float asinf(float x); -->
   <function name="asinf">
     <use-retval/>
     <pure/>
@@ -178,6 +188,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- long double asinl(long double x); -->
   <function name="asinl">
     <use-retval/>
     <pure/>
@@ -187,6 +198,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- double asinh(double x); -->
   <function name="asinh">
     <use-retval/>
     <pure/>
@@ -196,6 +208,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- float asinhf(float x); -->
   <function name="asinhf">
     <use-retval/>
     <pure/>
@@ -205,6 +218,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- long double asinhl(long double x); -->
   <function name="asinhl">
     <use-retval/>
     <pure/>
@@ -365,6 +379,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- double atan(double x); -->
   <function name="atan">
     <use-retval/>
     <pure/>
@@ -374,6 +389,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- float atanf(float x); -->
   <function name="atanf">
     <use-retval/>
     <pure/>
@@ -383,6 +399,7 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- long double atanl(long double x); -->
   <function name="atanl">
     <use-retval/>
     <pure/>