diff --git a/debug_compile.bash b/debug_compile.bash
index c1102cd7..05eb2280 100644
--- a/debug_compile.bash
+++ b/debug_compile.bash
@@ -1,2 +1,3 @@
+cmake -P distclean.cmake
 cmake -B build -S . -DCMAKE_BUILD_TYPE=Debug
 cmake --build build
diff --git a/production_compile.bash b/production_compile.bash
index bc4e8a87..8f07ea27 100644
--- a/production_compile.bash
+++ b/production_compile.bash
@@ -1,2 +1,3 @@
+cmake -P distclean.cmake
 cmake -B build -S .
 cmake --build build
diff --git a/src/regolith/regolith_streamtube.f90 b/src/regolith/regolith_streamtube.f90
index 28c28d08..16389a23 100644
--- a/src/regolith/regolith_streamtube.f90
+++ b/src/regolith/regolith_streamtube.f90
@@ -53,7 +53,7 @@
 !    Arguments : surf      ::  surface 
 !           
 ! 
-!  Notes       :  
+!  Notes       :  'eradc' is the center of the ejection radius. 'eradi' is inner, 'erado' is outer. 'cnt' is counting number. 'cmax', 'ri', and 'rip1' concern streamtube geometry.
 !
 !**********************************************************************************************************************************
 subroutine regolith_streamtube(user,surf,crater,domain,ejb,ejtble,xp,yp,xpi,ypi,lrad,ebh,rm,vsq,volm)