diff --git a/lib/xmet/thermo.py b/lib/xmet/thermo.py
index 052e98f..1b9fd43 100644
--- a/lib/xmet/thermo.py
+++ b/lib/xmet/thermo.py
@@ -21,8 +21,16 @@ def saturated_mixing_ratio(temp: float, pressure: float) -> float:
 
     return 621.97 * (es / (pressure - es))
 
+"""
+Return the height, in meters, at which a parcel of the given temperature is
+cooled to the given dewpoint.
+"""
 def lcl(temp: float, dewpoint: float) -> float:
     return (temp - dewpoint) / 0.008
 
+"""
+Return the temperature of a parcel cooled at either the dry or moist lapse
+rate for a given increase in height (in meters).
+"""
 def lapse(temp: float, rate: float, delta: float) -> float:
     return temp - (rate * (delta / 1000))