diff --git a/analyze-linuxcnc-wasm-blockers.sh b/analyze-linuxcnc-wasm-blockers.sh
index c42f61a..a21e465 100755
--- a/analyze-linuxcnc-wasm-blockers.sh
+++ b/analyze-linuxcnc-wasm-blockers.sh
@@ -3,6 +3,13 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
+# LinuxCNC source basis: this blocker scan is constrained to the RS274/WASM
+# manifest. Python and Boost.Python blockers come from
+# src/emc/rs274ngc/gcodemodule.cc, interp_namedparams.cc, interp_o_word.cc,
+# and the py*.cc module bindings; tooldata/native-backend blockers come from
+# src/emc/tooldata/tooldata_mmap.cc and tooldata_db.cc; native filesystem
+# blockers come from LinuxCNC RS274 sources such as interp_o_word.cc and
+# interp_write.cc.
 linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
 manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}