Index: uspace/lib/math/generic/trig.c
===================================================================
--- uspace/lib/math/generic/trig.c	(revision 58e7b26977afda549d7da683201907528ba22fd9)
+++ uspace/lib/math/generic/trig.c	(revision 78de83de52a9115dc77b09bb7029403dad8c2fb0)
@@ -371,4 +371,12 @@
 }
 
+/**
+ * Computes sine and cosine at the same time, which might be more efficient than
+ * computing each separately.
+ *
+ * @param x  Input value.
+ * @param s  Output sine value, *s = sinf(x).
+ * @param c  Output cosine value, *c = cosf(x).
+ */
 void sincosf(float x, float *s, float *c)
 {
@@ -384,4 +392,12 @@
 }
 
+/**
+ * Computes sine and cosine at the same time, which might be more efficient than
+ * computing each separately.
+ *
+ * @param x  Input value.
+ * @param s  Output sine value, *s = sin(x).
+ * @param c  Output cosine value, *c = cos(x).
+ */
 void sincos(double x, double *s, double *c)
 {