diff --git a/dsp/fn529fe0.cpp b/dsp/fn529fe0.cpp
index b695689..d5c8c51 100644
--- a/dsp/fn529fe0.cpp
+++ b/dsp/fn529fe0.cpp
@@ -217,7 +217,7 @@ static inline void fir_min_phase_52b3cd_internal(float* scr, size_t nbin) {
     const size_t N = 4096;
     static const double q = []{
         if (const char* e = getenv("RT_FIR_Q")) return atof(e);
-        return 0.8002203702926636; // from .rdata 1820013f0, refines 0.80 (BLOCKMAP 52b3cd)
+        return 0.8002203702926636; // live .rdata 1820013f0 via ptrace /proc/pid/mem (was 0.80 emp, BLOCKMAP 52b3cd)
     }();
     FFTPlan plan; fft::init_plan(&plan, 12);
     double hann[N];