diff --git a/.gitignore b/.gitignore
index 45a4c57..18b6970 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ pool
 piece
 move
 bits
+eval
 debug
 *.s
 /test/
diff --git a/src/bits.h b/src/bits.h
index 8d1773c..c3c1dc7 100644
--- a/src/bits.h
+++ b/src/bits.h
@@ -155,11 +155,4 @@ static inline int popcount64(u64 n)
 #define bit_for_each64(pos, tmp, ul)                                    \
     for (tmp = ul, pos = ffs64(tmp); pos; tmp &= (tmp - 1),  pos = ffs64(tmp))
 
-/*
-U64 ls1b = x & -x; // isolate LS1B
-   ...
-   x &= x-1; // reset LS1B
-}
-*/
-
 #endif  /* BITS_H */