diff --git a/TODO b/TODO
index 54d2a85..8204ac6 100644
--- a/TODO
+++ b/TODO
@@ -14,10 +14,8 @@ code:
 * should clip slope in triangle?
 * common smoothing policy (as control rate as possible?) - smoothing control?
 * svf bandpass out polarity too confusing (inverted in mm2)?
-* better common config.h (less stuff maybe, or more stuff - decide)
 * pan process with no out: should just reset coeffs?
 * get_y_z1, common strategy?
-* sqrt(0) and corner cases, common strategy?
 * bw_satur gain compensation to divide by actual gain (derivative) rather than gain parameter?
 * cite papers, thank authors
 * add initial state (x0) to reset state of lp1, ap1, mm1, hs1, ls1, others? all?
@@ -25,7 +23,6 @@ code:
 * bw_comb: integer target delay values?
 * bw_svf/lp1 automatically limited (max) prewarp frequency to avoid instability?
 * prewarp control in all derived filtering modules
-* bw_math: review types
 * src inside distortions? w/ control from outside?
 * bw_fuzz gain compensation?
 * make gain of distortions homogeneous?
@@ -78,6 +75,7 @@ code:
 * dump data structures (see note queue) and indicate error precisely
 * process (multi) no update
 * examples cpu usage
+* bw_math: review types in implementation
 
 build system:
 * make makefiles handle paths with spaces etc
diff --git a/include/bw_math.h b/include/bw_math.h
index a6f3da7..389c7dc 100644
--- a/include/bw_math.h
+++ b/include/bw_math.h
@@ -197,16 +197,12 @@ static inline float bw_minf(float a, float b);
 /*! <<<```
  *    Returns the minimum of `a` and `b`.
  *
- *    `a` and `b` must be finite.
- *
  *    #### bw_maxf()
  *  ```>>> */
 static inline float bw_maxf(float a, float b);
 /*! <<<```
  *    Returns the maximum of `a` and `b`.
  *
- *    `a` and `b` must be finite.
- *
  *    #### bw_clipf()
  *  ```>>> */
 static inline float bw_clipf(float x, float m, float M);
@@ -261,6 +257,8 @@ static inline void bw_intfracf(float x, float *i, float *f);
  *    Puts the integer part (floor) of `x` in `i` and the fractional part in
  *    `f`.
  *
+ *    `x` must be finite.
+ *
  *    #### bw_rcpf()
  *  ```>>> */
 static inline float bw_rcpf(float x);