diff --git a/CHANGES b/CHANGES
index f7a06d5a5..a511e1118 100644
--- a/CHANGES
+++ b/CHANGES
@@ -11,6 +11,7 @@ Pint Changelog
 - Fixed issue with `.to_compact` and Magnitudes with uncertainties / Quantities with units (PR #2069, issue #2044)
 - Add conductivity dimension. (#2112)
 - Add absorbance unit and dimension. (#2114)
+- Add membrane filtration flux and permeability dimensionality, and shorthand "LMH". (#2116)
 
 
 0.24.4 (2024-11-07)
diff --git a/pint/default_en.txt b/pint/default_en.txt
index 600e9a0f6..8f063333b 100644
--- a/pint/default_en.txt
+++ b/pint/default_en.txt
@@ -503,6 +503,13 @@ refractive_index_unit = [] = RIU
 [absorbance] = []
 absorbance_unit = [] = AU
 
+# Membrane filtration flux
+LMH = L / m**2 / h
+[membrane_flux] = [volume] / [area] / [time]
+
+# Membrane filtration permeability
+[membrane_permeability] = [membrane_flux] / [pressure]
+
 # Logaritmic Unit Definition
 #  Unit = scale; logbase; logfactor
 #  x_dB = [logfactor] * log( x_lin / [scale] ) / log( [logbase] )