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diff --git a/README b/README
index 97b4c6d..101eb10 100644
--- a/README
+++ b/README
@@ -12,6 +12,11 @@ there forever.  The information sent is e.g. the parameter file, date,
 time, machine, and user id of the run, location of the output data,
 number of iterations, an efficiency summary, etc.
 
+Meaning and pronunciation.  Formaline (or: formalin) is a solution of
+formaldehyde (methanal) in water.  The chemical formula of
+formaldehyde is H_2CO.  Formaline is commonly used to preserve
+biological specimen.  It is pronounced "fOrmaleen".
+
 
 
 TODO: