diff --git a/README.md b/README.md
index 3c4c358..093fe9a 100644
--- a/README.md
+++ b/README.md
@@ -418,6 +418,7 @@ A few examples of piecing together commands:
 
 - `fortune`, `ddate`, and `sl`: um, well, it depends on whether you consider steam locomotives and Zippy quotations "useful"
 
+- `units`: unit conversion and calculation program, converts furlongs per fortnights to twips per blinks, `/usr/share/units/definitions.units` worth reading by itself.
 
 ## More resources