1 files changed, 8 insertions, 0 deletions
diff --git a/lappy.py b/lappy.py
index 5d50372..49a70e9 100755
--- a/lappy.py
+++ b/lappy.py
@@ -1,5 +1,13 @@
 #!/usr/bin/env python3
 
+# Lappy is intended to be a drop-in replacement for Lapdog in cases
+# where one prefers simple dependencies over high performance and
+# scalability.
+#
+# One incompatibility is obviously that Lappy does not respect
+# PETSc/SLEPc command line switches, and one therefore has to specify
+# the number of eigenvalues/eigenvectors through --number.
+
 import scipy.sparse.linalg
 import sys
 import numpy as np