diff --git a/man/rgbasm.5 b/man/rgbasm.5
index 922f977bf..7834e531e 100644
--- a/man/rgbasm.5
+++ b/man/rgbasm.5
@@ -404,20 +404,16 @@ The following functions are designed to operate with fixed-point numbers:
 .It Fn MUL x y Ta Fixed-point multiplication
 .It Fn FMOD x y Ta Fixed-point modulo
 .It Fn POW x y Ta $x sup y$
-.It Fn LOG x y Ta $log sub y ( x )$ (such that
-.Ic LOG Ns ( Ic POW Ns ( x , y ) , y ) == x)
+.It Fn LOG x y Ta Logarithm of $x$ to the base $y$
 .It Fn ROUND x Ta Round $x$ to the nearest integer
 .It Fn CEIL x Ta Round $x$ up to the nearest integer
 .It Fn FLOOR x Ta Round $x$ down to the nearest integer
 .It Fn SIN x Ta Sine of $x$
 .It Fn COS x Ta Cosine of $x$
 .It Fn TAN x Ta Tangent of $x$
-.It Fn ASIN x Ta Inverse sine of $x$ (such that
-.Ic ASIN Ns ( Ic SIN Ns ( x ) ) == x)
-.It Fn ACOS x Ta Inverse cosine of $x$ (such that
-.Ic ACOS Ns ( Ic COS Ns ( x ) ) == x)
-.It Fn ATAN x Ta Inverse tangent of $x$ (such that
-.Ic ATAN Ns ( Ic TAN Ns ( x ) ) == x)
+.It Fn ASIN x Ta Inverse sine of $x$
+.It Fn ACOS x Ta Inverse cosine of $x$
+.It Fn ATAN x Ta Inverse tangent of $x$
 .It Fn ATAN2 y x Ta Angle between $( x , y )$ and $( 1 , 0 )$
 .El
 .EQ