diff --git a/README.md b/README.md
index 25c7d3a..13b74d4 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ Hamming distance for fixed-length `bytea` datatype (8-byte, 32-byte and 128-byte
 ### Compiling from source (CMake)
 
 ```bash
+apt install postgresql-server-11-dev
 cmake .
 make
 ```