diff --git a/biom/err.py b/biom/err.py
index 987f039f..c9d810b6 100644
--- a/biom/err.py
+++ b/biom/err.py
@@ -31,6 +31,12 @@
     Treatment of a table in which the number of sample metadata elements
     differs from the size of the data.
 
+hasnan : 'ignore'
+    Treatment of tables with nan values.
+
+hasinf : 'ignore'
+    Treatment of tables with inf values.
+
 Examples
 --------