diff --git a/include/noun/hashtable.h b/include/noun/hashtable.h
index 37878810d..871f47f29 100644
--- a/include/noun/hashtable.h
+++ b/include/noun/hashtable.h
@@ -35,17 +35,15 @@
       */
         typedef struct {
           c3_w     map_w;
-          c3_y     arm_w;
           u3h_slot sot_w[0];
         } u3h_node;
 
-      /* u3h_root: hash root table, with future-proof clock.
-       * If clk_w is greater than zero, this table is a cache.
+      /* u3h_root: hash root table
       */
         typedef struct {
-          c3_w     clk_w;
-          c3_w     use_w;
-          c3_y     arm_w;
+          c3_w     use_w; // number of lines currently filled
+          c3_w     max_w; // number of cache lines (0 for no trimming)
+          c3_w     clk_w; // clock arm, current hash
           u3h_slot sot_w[64];
         } u3h_root;
 
@@ -53,7 +51,6 @@
       */
         typedef struct {
           c3_w    len_w;
-          c3_y    arm_w;
           u3h_slot sot_w[0];
         } u3h_buck;
 
diff --git a/noun/hashtable.c b/noun/hashtable.c
index ebd0d15f6..662af8ee7 100644
--- a/noun/hashtable.c
+++ b/noun/hashtable.c
@@ -296,11 +296,11 @@ _ch_trim_node(u3h_slot* sot_w, c3_w lef_w)
         }
         u3a_wfree(han_u);
       }
-      else {
-        han_u->arm_w += 1;
-      }
       return c3y;
     }
+    else {
+      han_u->arm_w += 1;
+    }
   }
 
   han_u->arm_w = 0;
@@ -333,6 +333,8 @@ _ch_trim_slot(u3h_slot *sot_w, c3_w lef_w)
       }
       else {
         u3_noun kev = u3h_slot_to_noun(*sot_w);
+        fprintf(stderr, "addr: %p\r\n", kev);
+        u3m_p("losing(trim)", kev);
         u3z(kev);
         *sot_w = 0;
         return c3y;