diff --git a/astrobase/periodbase/kbls.py b/astrobase/periodbase/kbls.py
index <HASH>..<HASH> 100644
--- a/astrobase/periodbase/kbls.py
+++ b/astrobase/periodbase/kbls.py
@@ -2,7 +2,7 @@
 
 '''kbls.py - Waqas Bhatti (wbhatti@astro.princeton.edu) - Jan 2017
 
-Contains the Kovacs, et al. (2002) Box-Least-squart-Search  period-search
+Contains the Kovacs, et al. (2002) Box-Least-squared-Search period-search
 algorithm implementation for periodbase.
 
 '''
@@ -97,6 +97,24 @@ from ..varbase.lcfit import spline_fit_magseries
 NCPUS = cpu_count()
 
 
+#######################
+## UTILITY FUNCTIONS ##
+#######################
+
+def auto_transit_duration(min_radius_hint,
+                          max_radius_hint):
+    '''
+    This figures out the minimum and max transit duration (q) automatically.
+
+    q ~ 0.076 x R**(2/3) x P**(-2/3)
+
+    P = period in days
+    R = stellar radius in solar radii
+
+    '''
+
+
+
 
 ######################################
 ## BLS (Kovacs, Zucker, Mazeh 2002) ##
kbls: minor update