diff --git a/README.md b/README.md
index 969d24c6030d3ed5b582610e6b168574a2ad45cf..c70bbd50c2fb4a8c79cb2d9d998ddf753716f444 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,9 @@ Use PCDCP formatted files for input and/or output.
 ---
 ## Supported Algorithms ##
 
+### [DeltaF](./docs/DeltaF_usage.md) ###
+Calculate DeltaF from geographic, or observatory coordinates.
+
 ### [XYZ](./docs/XYZ_usage.md) ###
 Rotate data between coordinate systems. From HEZ or HDZ to XYZ and back.