--- a/README	Thu Aug 13 10:57:21 2020 -0400
+++ b/README	Fri Aug 21 08:46:38 2020 -0400
@@ -57,6 +57,19 @@
 
 This will install the binaries under the specified prefix.
 
+Note: If libjeffpc is not installed in a location that's part of the
+compiler and linker search path, you'll have to give cmake a hint where to
+find it.  You do this by defining these as necessary:
+
+  - WITH_JEFFPC_LIB=x      - directory containing libjeffpc.so
+  - WITH_JEFFPC_INCLUDES=x - directory containing jeffpc/jeffpc.h
+  - WITH_JEFFPC=x          - same as setting WITH_JEFFPC_LIB=x/lib and
+                             WITH_JEFFPC_INCLUDES=x/include
+
+For example:
+
+$ cmake . -DWITH_JEFFPC=/opt/jeffpc <...other cmake args...>
+
 
 Running
 =======