diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -11,6 +11,27 @@ You can download it for free from Microsoft's Web site.  Be sure to
 install the Visual C++ compiler and the MFC libraries; these are not
 installed by default.
 
+Each program has Debug, Release, and Distribute targets.  The
+Distribute target has some important functionality disabled,
+therefore, it's recommended that you generally use the Release target.
+
+Release binaries of WinProm and winelev are checked in at the top
+level.
+
+## File formats
+
+WinProm takes as input .elv raster files.  The winelev program, also
+included here, can convert from several common file formats to .elv. 
+
+Here is an example of how to find prominences with WinProm:
+
+- Download some terrain data from http://dds.cr.usgs.gov/srtm/version2_1/SRTM1/
+
+- Run winelev and convert the terrain data to a .elv file
+
+- Run WinProm, open the .elv file via File | Open | Elevation Map,
+  then find prominences via Operation | Analyze | Peaks.
+
 ## About prominence
 
 There are many good articles about topographic prominence on the Web.
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