diff --git a/mac/development.md b/mac/development.md
index 6d1856c07c3..898a06fada0 100644
--- a/mac/development.md
+++ b/mac/development.md
@@ -212,7 +212,7 @@ brew unlink pyqt
 brew unlink txt2tags
 
 # Install and verify GDAL/OGR with decent driver support
-# Do NOT install `gdal` (1.11.x) formula, unless you truely need it otherwise
+# Do NOT install `gdal` (1.11.x) formula, unless you truly need it otherwise
 # NOTE: keg-only, e.g. only available from HOMEBREW_PREFIX/opt/gdal2 prefix
 brew install osgeo/osgeo4mac/gdal2 --with-complete --with-libkml
 brew test osgeo/osgeo4mac/gdal2