diff --git a/lib/std/collections/bitset.c3 b/lib/std/collections/bitset.c3
index 4d91721c5..9e4ea88ca 100644
--- a/lib/std/collections/bitset.c3
+++ b/lib/std/collections/bitset.c3
@@ -136,6 +136,7 @@ fn void BitSet.unset(&self, usz i)
  @param i : "The index of the bit"
 
  @require i < SIZE : "Index was out of range"
+ @pure
 *>
 fn bool BitSet.get(&self, usz i) @operator([]) @inline
 {
@@ -144,6 +145,11 @@ fn bool BitSet.get(&self, usz i) @operator([]) @inline
 	return self.data[q] & (1 << r) != 0;
 }
 
+<*
+ Return the number of bits.
+
+ @pure
+*>
 fn usz BitSet.len(&self) @operator(len) @inline
 {
 	return SZ * BITS;
diff --git a/lib/std/core/string.c3 b/lib/std/core/string.c3
index d43be093f..4724c5569 100644
--- a/lib/std/core/string.c3
+++ b/lib/std/core/string.c3
@@ -138,7 +138,7 @@ fn String tformat(String fmt, args...) @format(0)
  Check if a character is in a set.
 
  @param c : `the character to check`
- @param [in] set : `The formatting string`
+ @param [in] set : `String containing the characters`
  @pure
  @return `True if a character is in the set`
 *>