diff --git a/README.md b/README.md
index ea55a36..e8a3f65 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ writing, the code, while it is intended to produce a bytestream that can be
 reconstructed into a working font, the reference decompression code is not
 done, and the exact format of that bytestream is subject to change.
 
+The build process depends on the g++ compiler.
+
 ## Build
 
 On a standard Unix-style environment:
@@ -27,6 +29,8 @@ make clean all
 
 ## Run
 
+Ensure the binaries from the build process are in your $PATH, then:
+
 ```
 woff2_compress myfont.ttf
 woff2_decompress myfont.woff2